A mold for preventing tooth shaft from retreating

Abstract

The utility model discloses a mold for preventing a tooth shaft from retreating, and belongs to the field of mold technology. It comprises: a machine body, a tooth shaft is threadedly installed, the machine body is installed with a first driving member for driving the tooth shaft to rotate, an external mold is connected to one side of the machine body, one end of the tooth shaft extends out of the machine body and an injection cavity is formed between the external mold; a pressure plate is slidably arranged on the machine body along the axis direction of the tooth shaft; a second driving member is installed on the machine body, and the second driving member can drive the pressure plate to press against the side of the tooth shaft away from the external mold. During injection molding, the second driving member presses the pressure plate against the side of the tooth shaft away from the external mold, so that the tooth shaft cannot retreat due to the injection pressure, and it is ensured that there is no gap between the tooth shaft and the external mold or the machine body, and the product is not prone to flashing, thereby ensuring the quality of the injection molded product.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a mold for preventing tooth shafts from retreating. Background Art

[0002] In injection molded products, if the product has internal threads, the tooth axis needs to be withdrawn from the product before the product can be taken out. The tooth axis is connected to the machine body through a threaded structure that is compatible with the product thread. The tooth axis is driven to rotate by the driving part, and the tooth axis will perform a spiral motion to rotate the tooth axis out of the internal thread range of the product. When the tooth axis needs to be reset for the next injection molding, just rotate the tooth axis in the opposite direction. However, during injection molding, due to a certain pressure in the injection molding cavity, the pressure will push the tooth axis, causing the tooth axis to overcome the friction between it and the machine body and perform a spiral motion, resulting in a gap between the tooth axis and other parts, which in turn causes the product to have a flashing problem, reducing the quality of the product. Utility Model Content

[0003] The utility model aims to provide a mold for preventing tooth shaft from retreating, so as to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The technical solution adopted to solve the above-mentioned technical problems is as follows: a mold for preventing a tooth shaft from retreating, comprising: a machine body, on which a tooth shaft is threadedly installed, the machine body being equipped with a first driving member for driving the tooth shaft to rotate, an outer mold being connected to one side of the machine body, one end of the tooth shaft extending out of the machine body and forming an injection cavity between the machine body and the outer mold; a pressure plate, slidably arranged on the machine body along the axial direction of the tooth shaft; a second driving member, installed on the machine body, the second driving member can drive the pressure plate to press against the side of the tooth shaft away from the outer mold.

[0005] This technical solution has at least the following beneficial effects: during injection molding, the second driving member will press the pressure plate against the side of the tooth axis away from the outer mold, so that the tooth axis cannot retreat due to the injection pressure, ensuring that no gap is generated between the tooth axis and the outer mold or the machine body, and the product is not prone to flashing, thereby ensuring the quality of the injection molded product.

[0006] As a further improvement of the above technical solution, the second driving member includes a power member and a balancing block rotatably mounted on the machine body, one end of the balancing block is in contact with the pressure plate, and the power member is used to drive the balancing block to rotate, and rotating the balancing block can push the pressure plate to press against the tooth shaft. The balancing block is driven to rotate by the power member. Since one end of the balancing block is in contact with the pressure plate, when the balancing block rotates toward the pressure plate, the end of the balancing block will push the pressure plate to slide, so that the pressure plate can be in contact with the tooth shaft, making it impossible for the tooth shaft to retreat. After injection molding, the power member can release the rotation control of the balancing block or drive the balancing block to reverse, so that the tooth shaft can push the pressure plate to ensure that it can withdraw from the thread range of the product, thereby ensuring the normal removal of the product.

[0007] As a further improvement of the above technical solution, the power part is a driving rod connected to the outer mold, and the driving rod abuts against the end of the balancing block away from the pressure plate. When the mold is closed, the outer mold drives the driving rod to press the balancing block, so that the balancing block rotates to push the pressure plate to press the tooth axis. During injection molding, the driving rod abuts against the end of the balancing block away from the pressure block, so that the balancing block rotates to the other end to abut against the pressure plate, and the pressure plate is pressed against the tooth axis to prevent the tooth axis from retreating during injection molding; after the injection molding is completed, the outer mold will open the mold in the direction away from the tooth axis, at which time the outer mold can drive the driving rod to move together, so that the driving rod releases the pressure restriction on the balancing block, so that the pressure plate can release the resistance restriction on the tooth axis under the action of the elastic member, and ensure that the tooth axis can be normally separated from the product; by driving the balancing block to rotate through the movement of the outer mold, the setting of the driving source can be reduced, the structure can be simplified, and the production cost can be reduced.

[0008] As a further improvement of the above technical solution, eccentric grooves are provided on both sides of the balancing block, and the eccentric grooves on both sides are symmetrically arranged with respect to the rotation center of the balancing block, and the side wall of the eccentric groove on one side contacts the pressure plate. The setting of the eccentric groove can make the side of the pressure plate that contacts the balancing block closer to the rotation center of the balancing block, and the rotation center of the balancing block can be closer to one side of the balancing block, so that the height space occupied by the balancing block and the pressure plate is smaller, the structure is more compact, and space is saved; in addition, the balancing block requires less force when rotating and swinging, is easier to rotate, and the rotation process is more stable and reliable.

[0009] As a further improvement of the above technical solution, the elastic member is a spring, the body is provided with a first positioning hole, the pressure plate is provided with a second positioning hole corresponding to the first positioning hole, and the two ends of the spring are respectively accommodated in the first positioning hole and the second positioning hole. The spring has a simple structure, low cost and good economic efficiency; by providing the first positioning hole and the second positioning hole, it is easy to install and position the spring, ensuring the stability of the spring during the expansion and contraction process, so as to ensure that the pressure plate can smoothly loosen the pressure restriction on the tooth axis through the elastic force of the spring.

[0010] As a further improvement of the above technical solution, the machine body is provided with a receiving groove for the rotation of the balancing block, and an inclined surface for limiting the rotation of the balancing block is provided on one side of the receiving groove. When the balancing block contacts the inclined surface of the receiving groove, the balancing block presses against the pressing plate, so that the pressing plate presses against the tooth axis. The inclined surface limits the rotation position of the balancing block, which can prevent the balancing block from excessive rotation, and can limit the distance of the pressing plate away from the tooth axis, ensuring that the sliding displacement of the pressing plate is within a preset range. In addition, in the process of the tooth axis thread being detached from the product, the pressing plate can also limit the wheelbase range of the threaded movement of the tooth axis, ensuring the threaded connection between the tooth axis and the machine body, and improving the operational reliability of the mold.

[0011] As a further improvement of the above technical solution, the machine body is equipped with a travel limit switch for sensing the rotation position of the balancing block, the sensing end of the travel limit switch is arranged at the end of the balancing block away from the pressure plate, and the travel limit switch is used to sense the distance relationship between the end of the balancing block away from the pressure plate and the sensing end. The formation of the limit switch can facilitate sensing the rotation position of the balancing block and collect information on the rotation end position of the balancing block, so as to combine the injection information and mold opening information of the mold, and perform operations such as control of the action sequence of each component, positioning control and detection of the position state.

[0012] As a further improvement of the above technical solution, a rotating shaft is passed through the middle of the balancing block, a mounting groove is provided on the machine body for the end of the rotating shaft to be embedded, and a mounting block is installed on the machine body to cover the opening position of the mounting groove. When assembling the mold, the rotating shaft is passed through the balancing block, the end of the rotating shaft is embedded in the mounting groove, and then the mounting block is installed on the machine body. The mounting block covers the opening position of one side of the mounting groove, so that the rotating shaft is restricted in the mounting groove, thereby achieving fixed installation of the rotating shaft. The assembly steps are simple and easy to operate, which can improve the efficiency of assembly.

[0013] As a further improvement of the above technical solution, the machine body is equipped with an elastic member, which provides elastic force for the pressure plate to move away from the tooth axis. When the second driving member releases the restriction on the pressure plate, the pressure plate can move away from the tooth axis through the elastic force of the elastic member, and the pressure plate does not need to be pushed by the tooth axis or the second driving member, so as to better ensure that the tooth axis can normally exit the product range.

[0014] As a further improvement of the above technical solution, the machine body is equipped with a guide rod, and the tooth axis and the pressure plate are both inserted into the guide rod. The guide rod can guide the sliding of the tooth axis and the pressure plate relative to the machine body at the same time, which can better ensure the consistency of the sliding direction of the tooth axis and the pressure plate, and the structural design is ingenious. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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:

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0017] Figure 2 It is a partial cross-sectional structural schematic diagram of an embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the installation structure of the pressure plate in the embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of the installation structure of the tooth axis in the embodiment of the utility model;

[0020] Figure 5 The figure is a schematic diagram of the installation structure of the balancing weight in the embodiment of the utility model.

[0021] The machine body 10, the tooth shaft 11, the outer mold 13, the inner mold 14, the threaded cylinder 15, the first driving member 20, the pressure plate 30, the second driving member 40, the balancing block 41, the elastic member 42, the driving rod 43, the eccentric groove 50, the protrusion 60, the groove 61, the first positioning hole 70, the second positioning hole 71, the accommodating groove 80, the inclined surface 81, the rotating shaft 82, the mounting groove 83, the mounting block 84, the travel limit switch 85, the guide rod 86, the first mold plate 91, the second mold plate 92, the third mold plate 93, the fourth mold plate 94, the fifth mold plate 95, the sixth mold plate 96, the seventh mold plate 97, the eighth mold plate 98, and the ninth mold plate 99. 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 1-5 A mold for preventing a tooth axis from retreating comprises a machine body 10, an outer mold 13 is installed above the machine body 10, the machine body 10 comprises an inner mold 14 at the top, the outer mold 13 and the inner mold 14 are arranged to cover each other, a tooth axis 11 is threadedly installed on the machine body 10, the tooth axis 11 is at the bottom of the inner mold 14, one end of the tooth axis 11 extends out of the inner mold 14 and is embedded in the outer mold 13, and an injection cavity is formed between the outer mold 13, the inner mold 14 and the tooth axis 11. The machine body 10 can be equipped with multiple outer molds 13 and inner molds 14 and correspond to each other, each inner mold 14 can correspond to multiple tooth axes 11, and each tooth axis 11 corresponds to an injection cavity. An injector is installed on the machine body 10, and plastic liquid is injected into the corresponding injection cavity through the injector. After cooling, the mold opening operation can be performed, that is, the outer mold 13 is removed and the tooth axis 11 is removed from the product range, and then the product is separated from the inner mold 14 and taken out to complete the production of the product.

[0027] The machine body 10 includes nine layers of mold plates arranged in sequence, and the nine layers of mold plates are respectively a first mold plate 91, a second mold plate 92, a third mold plate 93, a fourth mold plate 94, a fifth mold plate 95, a sixth mold plate 96, a seventh mold plate 97, an eighth mold plate 98 and a ninth mold plate 99.

[0028] The injection molding machine is installed on the first mold plate 91, and the outer mold 13 is installed on the second mold plate 92. The first mold plate 91 and the second mold plate 92 are fixed to each other, and the mold opening operation can be performed by setting a driving component. The inner mold 14 is installed on the third mold plate 93, and the hinge end of the tooth shaft 11 is between the outer mold 13 and the inner mold 14. A bearing is installed on the outer side of the middle part of the tooth shaft 11. The tooth shaft 11 is rotatably connected with the fourth mold plate 94 through the bearing. The fourth mold plate 94 is provided with a bearing groove for the bearing to be installed on the side close to the third mold plate 93. The bearing is inserted into the tooth shaft 11 and embedded in the bearing groove, which can facilitate the positioning and installation of the bearing. The fifth mold plate 95 is embedded with a threaded barrel 15. The threaded barrel 15 is provided with a thread with the same pitch as the hinge end of the tooth shaft 11. The threaded barrel 15 is threadedly connected with the tooth shaft 11 through the inner thread, so that the tooth shaft 11 is threadedly connected with the fifth mold plate 95 through the threaded barrel 15, so as to facilitate the processing and manufacturing of the fifth mold plate 95.

[0029] A bearing is also installed on the outer side of the bottom of the tooth axis 11, and the tooth axis 11 is rotatably connected to the sixth mold plate 96 through the bearing, so as to better ensure the smoothness of rotation of the tooth axis 11. A pressing plate 30 is installed on the side of the sixth mold plate 96 away from the fifth mold plate 95, and the seventh mold plate 97 is on the side of the pressing plate 30 away from the sixth mold plate 96. The seventh mold plate 97 is installed with a guide rod 86, which is vertically distributed and corresponds to the tooth axis 11 one by one. The length direction of the guide rod 86 is parallel to the axial direction of the tooth axis 11. The guide rod 86 is slidably penetrated on the pressing plate 30 and the corresponding tooth axis 11 in turn, so that the tooth axis 11 and the pressing plate 30 are guided by the guide rod 86 and slide in a limited position, so as to ensure the consistency of the tooth axis 11 and the pressing plate 30 in the sliding direction. The distance between the sixth mold plate 96 and the seventh mold plate 97 is greater than the thickness of the pressing plate 30, so that the pressing plate 30 can slide within a certain range. The eighth mold plate 98 is located on the side of the seventh mold plate 97 away from the pressing plate 30, and the ninth mold plate 99 is located on the side of the eighth mold plate 98 away from the seventh mold plate 97. The third mold plate 93, the fourth mold plate 94, the fifth mold plate 95, the sixth mold plate 96, the seventh mold plate 97, the eighth mold plate 98 and the ninth mold plate 99 can be fixedly connected by bolts.

[0030] The machine body 10 can be provided with a plurality of groups of injection cavities and their corresponding components according to factors such as the actual space size. Each group of injection cavities can include a plurality of ring-shaped injection cavities, so as to facilitate injection molding operations in each group of injection cavities.

[0031] The machine body 10 is also equipped with a first driving member 20 and a second driving member 40. The first driving member 20 includes a motor and a driving gear, a primary transmission gear, a secondary transmission gear and a driven gear rotatably mounted on the machine body 10. The motor is mounted on the machine body 10, and can be specifically mounted on the bottom of the ninth mold plate 99. The output end of the motor is connected to the driving gear. The driving gear and the primary transmission gear are respectively rotatably mounted on the side of the ninth mold plate 99 close to the eighth mold plate 98 and meshed with each other. The primary transmission gear is coaxially fixedly connected with the secondary transmission gear, and the secondary transmission gear is meshed with the driven gear. The number of the primary transmission gears corresponds to the number of injection cavities, and the number of driven gears meshing with the same secondary transmission gear corresponds to the number of injection cavities in each group of injection cavities. The driven gear is fixedly connected to the tooth shaft 11 in a one-to-one correspondence, and the sixth mold plate 96 is provided with a cavity that can accommodate the axial movement of the driven gear. The motor can drive the driving gear to rotate, so as to drive the primary transmission gear to rotate. After the secondary transmission gear rotates synchronously with the primary transmission gear, it drives the driven gear to rotate, so as to drive the tooth shaft 11 to rotate. Under the action of the thread of the threaded barrel 15, the tooth shaft 11 can make a spiral motion, so that the tooth shaft 11 can be screwed out of the product after the injection molding is completed. It should be noted that the thickness of the secondary transmission gear is greater than that of the driven gear, which can allow the driven gear to move axially relative to the secondary transmission gear without breaking away from the transmission relationship, so as to ensure that the tooth shaft 11 can be reset by the reverse rotation of the motor, and then the next injection molding process can be carried out.

[0032] A boss corresponding to the tooth axis 11 is arranged on the top of the pressing plate 30 . The boss is embedded in the bottom position of the sixth mold plate 96 , and the top of the boss can be arranged to abut against the bottom of the tooth axis 11 .

[0033] The output end of the second driving member 40 is connected to the pressing plate 30. During injection molding, the second driving member 40 can drive the pressing plate 30 to move along the axial direction of the tooth axis 11, so that the boss abuts against the bottom of the tooth axis 11, restricting the tooth axis 11, preventing the tooth axis 11 from retreating due to the injection molding pressure, and reducing the formation of product flash. After injection molding, the second driving member 40 can release the abutment restriction of the pressing plate 30 on the tooth axis 11, ensuring that the tooth axis 11 can be normally screwed out of the product thread, ensuring the normal removal of the product.

[0034] The body 10 includes a bracket, a rotating shaft 82 and a mounting block 84 arranged at two sides. The bracket is provided with a receiving groove 80. The bracket is provided with mounting grooves 83 at two opposite sides of the receiving groove 80. The two ends of the rotating shaft 82 are respectively accommodated in the mounting grooves 83 on the corresponding sides. The mounting block 84 is covered at one side opening of the receiving groove 80 and is fixedly connected to the bracket, so as to prevent the end of the rotating shaft 82 from being separated from the corresponding mounting groove 83, and facilitate the installation and removal of the rotating shaft 82. The second driving member 40 includes a balancing block 41 rotatably mounted in the middle of the rotating shaft 82, and the rotating shaft 82 is located at the center of the balancing block 41. The balancing block 41 is in the receiving groove 80, and the space of the receiving groove 80 can be used for the balancing block 41 to rotate. One end of the balancing block 41 abuts against the bottom of the pressing plate 30. When the balancing block 41 rotates relative to the bracket, it can push the pressing plate 30 so that the boss can abut against the bottom of the tooth axis 11 to limit the tooth axis 11. The second driving member 40 also includes a power member installed on the bracket, and the power member is used to drive the balancing block 41 to rotate. The power member is a driving rod 43, and the top of the driving rod 43 is fixedly installed on the first mold plate 91 and the second mold plate 92 by bolts. A groove 61 is provided on one side of the first mold plate 91, and a protrusion 60 is integrally formed on the driving rod 43. The protrusion 60 is embedded and installed in the groove 61, so that the positioning and installation of the driving rod 43 can be facilitated. The bottom of the driving rod 43 abuts against the end of the balancing block 41 away from the abutting plate 30, and the abutting plate 30 and the driving rod 43 are respectively located on both sides of the rotating shaft 82.

[0035] During injection molding, the first mold plate 91, the second mold plate 92 and the third mold plate 93 are covered, so that the outer mold 13 and the inner mold 14 are covered, and an injection cavity is formed between the outer mold 13, the inner mold 14 and the tooth axis 11. At this time, the bottom of the driving rod 43 abuts against one end of the balance block 41, so that the other end of the balance block 41 abuts against the pressure plate 30, and the boss of the pressure plate 30 abuts against the bottom of the tooth axis 11, thereby preventing the tooth axis from retreating due to the injection pressure. After the injection molding is completed, the first mold plate 91 and the second mold plate 92 are separated from the third mold plate 93, and the outer mold 13 is separated from the inner mold 14 to realize mold opening. At this time, the driving rod 43 is lifted up at the same time and away from the balancing block 41, so that the balancing block 41 can rotate relatively by a certain angle. When the tooth shaft 11 is driven to rotate by the first driving member 20, the tooth shaft 11 withdraws from the thread range of the product, and the bottom of the tooth shaft 11 pushes the pressure plate 30 downward. Since the balancing block 41 is not restricted by the driving rod 43 and can rotate, the pressure plate 30 no longer restricts the retraction action of the tooth shaft 11, so as to ensure that the tooth shaft 11 can be normally rotated out of the product range to facilitate the removal of the product.

[0036] An elastic member 42 may be installed between the sixth mold plate 96 and the pressure plate 30. The elastic member 42 may push the pressure plate 30 away from the sixth mold plate 96 when the mold is opened, so that the pressure plate 30 does not need to be pushed laboriously when the tooth axis 11 retracts, and the normal retraction of the tooth axis 11 is better guaranteed. Specifically, a first positioning hole 70 that penetrates through the sixth mold plate 96 may be opened, and a second positioning hole 71 may be opened on the top of the pressure plate 30. The first positioning hole 70 and the second positioning hole 71 are arranged in a one-to-one correspondence. The elastic member 42 is a threaded spring, and the two ends of the threaded spring are respectively accommodated in the first positioning hole 70 and the second positioning hole 71, so as to facilitate the installation, disassembly and maintenance of the threaded spring.

[0037] If multiple groups of injection cavities are provided on the machine body 10, two pressing plates 30 may be provided, and each pressing plate 30 is responsible for contacting the toothed shafts 11 corresponding to half of the groups of injection cavities. In order to drive the pressing plates 30 more stably, one pressing plate 30 may be provided with two driving rods 43 and two balancing blocks 41 for driving, and the two driving rods 43 are respectively provided at the two sides of the machine body 10, and the ends of the two balancing blocks 41 away from the corresponding side of the driving rods 43 contact the two sides of the pressing plate 30 respectively.

[0038] In other embodiments, the power component may be a motor, which is installed on one side of the seventh mold plate 97, the eighth mold plate 98 or the ninth mold plate 99. The balancing block 41 is transmission-connected to the output end of the motor. The rotation of the motor can drive the balancing block 41 to rotate, so that the balancing block 41 can be made to contact or not contact the pressure plate 30, so as to switch the pressure plate 30 between restricting or not restricting the tooth axis 11, thereby preventing the tooth axis 11 from retreating during injection molding.

[0039] In other embodiments, the second driving member 40 may be a telescopic cylinder, which may be mounted on one side of the seventh mold plate 97, the eighth mold plate 98 or the ninth mold plate 99, and the pressing plate 30 may be mounted on the output end of the telescopic cylinder. The telescopic cylinder is controlled to extend and retract according to the injection information to drive the pressing plate 30 to contact or move away from the tooth axis 11, thereby preventing the tooth axis 11 from retreating during injection.

[0040] An inclined surface 81 is provided at the bottom of the accommodating groove 80 , and the inclined surface 81 can limit the rotation range of the balancing block 41 to prevent the balancing block 41 from excessively rotating, thereby better ensuring the limiting effect of the pressing plate 30 on the tooth axis 11 .

[0041] An eccentric groove 50 is provided at the position where the balancing block 41 contacts the pressure plate 30. This allows the pressure plate 30 to be closer to the rotating shaft 82, and the balancing block 41 can be more reasonably installed. The pressure plate 30 and the balancing block 41 are more compact, and the space occupied as a whole is smaller. In addition, an eccentric groove 50 is also provided at the back side of the end of the balancing block 41 that contacts the driving rod 43, so that the eccentric grooves 50 on both sides of the balancing block 41 are centrally symmetrically arranged with respect to the center of the balancing block 41, and the shape of the balancing block 41 is also centrally symmetrically arranged, so that the rotation process of the balancing block 41 can be smoother.

[0042] Two travel limit switches 85 are installed on both sides of the bracket, the sixth mold plate 96 or the fifth mold plate 95. The width of the balance block 41 is wider than the width of the driving rod 43. The position where the balance block 41 protrudes from the driving rod 43 is provided with an inclined surface, and the inclined surface is located at the end of the balance block 41 away from the pressing plate 30. The sensing ends of the two travel limit switches 85 on the same side are arranged corresponding to the inclined surfaces of the corresponding two balance blocks 41, so that the sensing ends of the travel limit switches can sense the distance between the ends of the balance blocks and the sensing ends, so that the four travel limit switches 85 can sense the rotation position of the balance block 41, and transmit the rotation position information to the program control center, and then control the program processing flow of the mold in combination with the injection molding information, mold opening information, etc., which can better ensure the smooth progress of injection molding.

[0043] 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 mold for preventing the tooth shaft from retreating, characterized in that: include: A machine body, a tooth shaft is threadedly installed on the machine body, a first driving member for driving the tooth shaft to rotate is installed on the machine body, an outer mold is connected to one side of the machine body, one end of the tooth shaft extends out of the machine body and an injection cavity is formed between the outer mold; A pressing plate is slidably arranged on the machine body along the axis direction of the tooth axis; A second driving member is mounted on the machine body, and the second driving member can drive the pressing plate to press against a side of the tooth axis away from the outer mold.

2. A die for preventing the tooth shaft from retreating according to claim 1, characterized in that: The second driving member includes a power member and a balancing block rotatably mounted on the body, one end of the balancing block abuts against the pressure plate, the power member is used to drive the balancing block to rotate, and rotating the balancing block can push the pressure plate to press against the tooth axis.

3. A die for preventing the tooth shaft from retreating according to claim 2, characterized in that: The power part is a driving rod connected to the outer mold, and the driving rod abuts against the end of the balancing block away from the pressure plate. When the mold is closed, the outer mold drives the driving rod to press the balancing block, causing the balancing block to rotate to push the pressure plate to press the tooth axis.

4. A die for preventing the tooth shaft from retreating according to claim 3, characterized in that: Eccentric grooves are provided on both sides of the balancing block. The eccentric grooves on both sides are symmetrically arranged with respect to the rotation center of the balancing block, and the side wall of the eccentric groove on one side contacts the pressure plate.

5. The mold for preventing the tooth shaft from retreating according to claim 2, characterized in that: The machine body is provided with a receiving groove for the balancing block to rotate, and one side of the receiving groove is provided with an inclined surface for limiting the rotation of the balancing block. When the balancing block contacts the inclined surface of the receiving groove, the balancing block presses the pressing plate to press the tooth axis.

6. A die for preventing the tooth shaft from retreating according to claim 2, characterized in that: The machine body is equipped with a travel limit switch for sensing the rotation position of the balancing block. The sensing end of the travel limit switch is arranged at the end of the balancing block away from the pressure plate. The travel limit switch is used to sense the distance relationship between the end of the balancing block away from the pressure plate and the sensing end.

7. A die for preventing the tooth shaft from retreating according to claim 2, characterized in that: A rotating shaft is passed through the middle of the balancing block, a mounting groove is provided on the machine body for the end of the rotating shaft to be embedded, and a mounting block is installed on the machine body to cover the opening position of the mounting groove.

8. The mold for preventing the tooth shaft from retreating according to claim 2, characterized in that: The machine body is provided with an elastic member, and the elastic member provides an elastic force for the pressing plate to move away from the tooth axis.

9. A die for preventing the tooth shaft from retreating according to claim 8, characterized in that: The elastic member is a spring, the body is provided with a first positioning hole, the pressure plate is provided with a second positioning hole corresponding to the first positioning hole, and two ends of the spring are respectively accommodated in the first positioning hole and the second positioning hole.

10. The mold for preventing the tooth shaft from retreating according to claim 1, characterized in that: The machine body is provided with a guide rod, and the tooth shaft and the pressure plate are both inserted into the guide rod.

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