Rack-driven twisted tooth demolding mechanism and twisted tooth mold

Abstract

The utility model relates to a rack-driven twisted tooth demoulding mechanism and a twisted tooth mould, which comprise an oil cylinder arranged on the outer side wall of a mould body, and a strip-shaped rack which is driven by the oil cylinder and linearly reciprocates in the mould body, and one end of the rack far away from the oil cylinder penetrates out of the mould body, the rack is in transmission connection with a transmission structure which is arranged in the mold body and drives the twisted tooth column core in the mold body to rotate, and the transmission structure comprises a first gear in transmission connection with the rack, a second gear parallel to the first gear and coaxially rotating with the first gear, and at least one third gear in transmission connection with the second gear. The third gear is arranged at the non-demolding end of the twisted tooth column core and coaxially rotates with the twisted tooth column core; meanwhile, the utility model discloses a twisted tooth mold adopting the demolding mechanism. The utility model solves the problem that the twisted teeth are inconvenient to demould.

Description

Technical Field

[0001] The utility model relates to the field of thread-cutting moulds, in particular to a thread-cutting demoulding mechanism and a thread-cutting mould driven by a rack. Background Art

[0002] Injection molding is a processing method used in mass production of certain parts. The specific steps are to inject the heated and melted material into the injection cavity formed by the front mold core and the rear mold core by high pressure, and obtain the molded product after cooling and solidification. The injection mold is the main injection molding equipment used to produce plastic products. It mainly includes a front mold and a rear mold. The front mold is installed on the fixed seat plate of the injection molding machine, and the rear mold is installed on the movable seat plate of the injection molding machine. When injecting some products with internal threads, the injection cavity of the mold is generally provided with a threaded column core. During injection molding, the plastic product can form a hole with an internal thread. After the injection molding is completed, the threaded column core needs to be rotated to demold it. The core removal process of the injection mold with a threading mechanism is relatively complicated. The common method is to force the product out of the mold cavity manually. Such a strong demolding method will damage the thread characteristics of the product during the process of the product leaving the mold, reducing the product qualification rate. Utility Model Content

[0003] In view of the existing deficiencies, the utility model provides a rack-driven thread-cutting demoulding mechanism and a thread-cutting mould.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a rack-driven threaded tooth demoulding mechanism, including a cylinder for being arranged on the outer side wall of a mold body, a long strip of rack driven by the cylinder for linear reciprocating movement in the mold body and with one end away from the cylinder passing through the mold body, the rack transmission is connected with a transmission structure arranged in the mold body for driving the threaded tooth column core in the mold body to rotate, the transmission structure includes a first gear connected to the rack transmission, a second gear arranged parallel to the first gear and rotating coaxially with the first gear, and at least one third gear transmission connected to the second gear, the third gear is arranged on the non-demolding end of the threaded tooth column core and rotates coaxially with the threaded tooth column core.

[0005] Preferably, two third gears are arranged at intervals and are arranged on the same side of the second gear.

[0006] Preferably, it also includes a gear mounting seat arranged in the mold body, one side of the gear mounting seat is provided with a straight groove with an axis perpendicular to the axis and a first groove with a major arc shape in cross section, and the straight groove and the first groove are connected at the position where the chord of the first groove is located; the rack is installed in the straight groove, and the first gear is installed in the first groove and partially extends into the straight groove to mesh with the rack; the gear mounting seat is provided with a second groove for installing the second gear and a third groove with a major arc shape in cross section for installing the third gear on the back side of the first groove, and the second groove and the third groove are connected at the position where the chord of the third groove is located; the second gear is installed in the second groove, and the third gear is installed in the third groove and partially extends into the second groove to mesh with the second gear; the bottom of the second groove is provided with a first through hole connecting the first groove and the second groove, a rotating shaft is installed in the first through hole, and the first gear and the second gear are installed on the rotating shaft.

[0007] Preferably, the bottom of the second groove is flush with the bottom of the third groove, and the bottom of the straight groove is flush with the bottom of the first groove.

[0008] Preferably, the rack, the first gear, the second gear and the third gear have the same module.

[0009] Preferably, the rack and the piston rod of the oil cylinder are detachably connected.

[0010] Preferably, the front end of the oil cylinder piston rod is threadedly connected with a connecting piece, the end of the connecting piece away from the piston rod is provided with a T-shaped bayonet, and the end of the rack extends with a snap-fit ​​head that matches and snaps into the bayonet.

[0011] A rack-driven thread cutting die comprises a thread cutting demoulding mechanism as described in any one of the above items.

[0012] The beneficial effect of the utility model is that the utility model utilizes an oil cylinder externally arranged outside the mold body to drive the rack inside the mold body to perform linear motion, and the rack drives the first gear to rotate. The first gear and the second gear are coaxial, and the second gear also rotates synchronously with the first gear, and then the second gear drives the third gear to rotate, and the threaded tooth column core rotates with the third gear, thereby realizing smooth demoulding of the threaded tooth. The gear transmission structure can better adapt to the mold, making the structure inside the mold more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front structural schematic diagram of an embodiment of the utility model;

[0014] Figure 2 It is a schematic diagram of the back structure of an embodiment of the utility model;

[0015] Figure 3This utility model embodiment Figure 2 A is a schematic diagram of the enlarged structure of the middle part;

[0016] Figure 4 This is a front structural schematic diagram of a gear mounting seat according to an embodiment of the utility model;

[0017] Figure 5 It is a schematic diagram of the back structure of the gear mounting seat of the embodiment of the utility model;

[0018] Figure 6 It is a structural schematic diagram of a thread cutting die according to an embodiment of the utility model;

[0019] Names and serial numbers of parts in the figure: 1-mold body 10-twisted tooth column core 2-oil cylinder 20-piston rod 3-rack 30-clamping head 4-first gear 5-second gear 6-third gear 7-gear mounting seat 70-straight groove 71-first groove 72-second groove 73-third groove 720-first through hole 721-rotating shaft 8-connecting piece 80-bayonet. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the embodiments, and a clear and complete description will be given. It should be understood that these embodiments are used to illustrate the present invention and are not limited to the scope of the present invention. The implementation conditions adopted in the embodiments can be further adjusted according to the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in the conventional experiments. In addition, the directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only referenced to the directions of the attached diagrams. The directional terms used are for better and clearer explanation and understanding of the present invention, rather than indicating or implying the orientation that the present invention must have, and therefore cannot be understood as limitations on the present invention.

[0021] The utility model is implemented as follows Figures 1 to 6As shown in the figure, a rack-driven threaded tooth demoulding mechanism includes a cylinder 2 for being arranged on the outer side wall of a mold body 1, a long strip-shaped rack 3 driven by the cylinder 2 and moving linearly back and forth in the mold body 1 and passing through the mold body 1 at one end away from the cylinder 2, the mold body 1 includes a front mold and a rear mold, the cylinder 2 is arranged on the outer side wall of the rear mold, the rack 3 is arranged in the rear mold and passes through the side wall of the rear mold opposite to the cylinder 2, that is, the cylinder 2 is arranged on the upper side of the rear mold, and the lower end of the rack 3 passes through the lower side of the rear mold, and the rack 3 is driven by the cylinder 2 to perform linear motion in the rear mold, and the rack 3 is driven to drive the cylinder 2 to drive the threaded tooth column core 10 in the mold body 1 to rotate, and the transmission structure includes a first gear 4 driven by the rack 3, and a first gear 4 parallel to the first gear 4. The second gear 5 that is arranged and rotates coaxially with the first gear 4, and at least one third gear 6 that is transmission-connected with the second gear 5, the third gear 6 is arranged on the non-demolding end of the threaded tooth column core 10 and rotates coaxially with the threaded tooth column core 10, so that a gear transmission structure is formed, which is more suitable for application in the mold, avoiding the problem of the mold structure being not compact due to the connecting rod or belt transmission, the first gear 4, the second gear 5 and the third gear 6 are all arranged on the rear mold, when demolding, the oil cylinder 2 drives the rack 3 to move linearly, the rack 3 drives the first gear 4 to rotate, the first gear 4 and the second gear 5 are coaxial, the second gear 5 also rotates synchronously with the first gear 4, and then the second gear 5 drives the third gear 6 to rotate, the threaded tooth column core 10 rotates with the third gear 6, so as to realize the smooth demolding of the threaded tooth. At this time, the third gear 6 can be arranged at intervals according to production requirements, and arranged on the same side of the second gear 5, or arranged at intervals along the circumference of the second gear 5, so that multiple threads can be demolded at the same time, and the production efficiency is improved.

[0022] In order to facilitate the installation of each gear in the rear mold, a gear mounting seat 7 is arranged in the mold body 1, that is, a gear mounting seat 7 is arranged in the rear mold, and each gear is arranged on a mounting seat, so that the structure is more compact and complete. A linear groove 70 with an axis perpendicular to each other and a first groove 71 with a cross-section in the shape of a superior arc are arranged on one side of the gear mounting seat 7. The linear groove 70 and the first groove 71 are adjacently arranged on the back of the gear mounting seat 7. The linear groove 70 is in the up-down direction, and the axis of the first groove 71 is the front-to-back direction, which is similar to the structure formed by cutting off a small part of a circular groove from the linear groove 70. The linear groove 70 and the first groove 71 are connected at the position where the chord of the first groove is located, and the rack 3 is installed in the linear groove 70. The first gear 4 is installed in the first groove 71 and partially extends into the linear groove 70 to mesh with the rack 3. That is to say, the first groove 71 is provided with a notch that passes through the linear groove 70 and the first groove 71 on the side where the chord is located. After the first gear 4 is installed in the first groove 71, part of it passes through the notch and extends into the linear groove 70, thus realizing the meshing transmission between the rack 3 installed in the linear groove 70 and the first gear 4; the gear mounting seat 7 is provided with a second groove 72 for mounting the second gear 5 and a third groove 73 with a superior arc shape for mounting the third gear 6 on the back side of the first groove 71, and the second groove 72 and the third groove 73 are connected at the position where the chord of the third groove 73 is located; the second gear 5 is installed in the first groove 71. In the second groove 72, the third gear 6 is installed in the third groove 73 and partially extends into the second groove 72 to mesh with the second gear 5. The first groove 71 is arranged on the back of the gear mounting seat 7, so the second groove 72 and the third groove 73 are arranged on the front of the gear mounting seat 7. The third groove 73 is arranged along the circumference of the second groove 72. If two third grooves 73 are arranged, the two third grooves 73 are arranged symmetrically in the vertical plane; similarly, the connection between the second groove 72 and the third groove 73 is also provided with a notch on the surface where the chord of the third groove 73 is located, and the meshing transmission of the third gear 6 and the second gear 5 is realized through the notch; the bottom of the second groove 72 is provided with a groove connecting the first groove 71 and the second groove The first through hole 720 of 72, a rotating shaft 721 is installed in the first through hole 720, the first gear 4 and the second gear 5 are installed on the rotating shaft 721, the second groove 72 is a circular groove, the first through hole 720 is also a circular through hole, the diameter of the first through hole 720 is smaller than the smaller diameter of the first gear 4 and the second gear 5, thus preventing the first gear 4 and the second gear 5 from moving from the surface where they are on the gear mounting seat 7 to the opposite side through the first through hole 720, the rotating shaft 721 is matched and installed in the first through hole 720 and rotates therein, so that the front end of the rotating shaft 721 is located in the second groove 72 for installing the second gear 5, and the rear end is located in the first groove 71 for installing the first gear 4.The bottom of the second groove 72 is flush with the bottom of the third groove 73, and the bottom of the linear groove 70 is flush with the bottom of the first groove 71, so that the rack 3 and the first gear 4, the second gear 5 and the third gear 6 can be well meshed, ensuring smooth transmission. At the same time, the modules of the rack 3, the first gear 4, the second gear 5 and the third gear 6 are the same.

[0023] Further improvements such as Figure 2 and Figure 3 As shown in the figure, the rack 3 and the piston rod 20 of the oil cylinder 2 are detachably connected, and the detachable structure is convenient for the maintenance and replacement of the rack 3 or the oil cylinder 2, and is convenient for use. For the detachable structure between them, the front end of the piston rod 20 of the oil cylinder 2 is threadedly connected with a connecting piece 8, and the end of the connecting piece 8 away from the piston rod 20 is provided with a T-shaped bayonet 80, and the end of the rack 3 extends with a snap-fit ​​head 30 that matches and snaps into the bayonet 80, and an external thread is provided at the lower end of the piston rod 20 of the oil cylinder 2; the upper end of the connecting piece 8 is provided with a threaded hole, and the lower end is provided with a bayonet 80; the piston rod 20 of the oil cylinder 2 is threadedly connected and installed in the threaded hole, and then the snap-fit ​​head 30 at the upper end of the rack 3 is matched and snapped into the bayonet 80, and the connecting piece 8 is located in the linear groove 70 adjacent to the upper end of the linear groove 70.

[0024] A rack-driven tooth die, such as Figure 6 As shown in , it includes a mold body 1, in which a thread cutting demoulding mechanism as described in any one of the above items is arranged,

[0025] Although the utility model has been described in detail above with general descriptions and specific implementation schemes, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A rack-driven thread-cutting demoulding mechanism, characterized in that: It includes an oil cylinder for being arranged on the outer side wall of the mold body, and an elongated rack driven by the oil cylinder and moving linearly back and forth in the mold body and with one end away from the oil cylinder passing through the mold body, the rack transmission is connected with a transmission structure arranged in the mold body and driving the twisting tooth column core in the mold body to rotate, the transmission structure includes a first gear transmission connected to the rack, a second gear arranged parallel to the first gear and rotating coaxially with the first gear, and at least one third gear transmission connected to the second gear, the third gear is arranged on the non-demolding end of the twisting tooth column core and rotates coaxially with the twisting tooth column core.

2. According to the rack-driven thread-cutting demoulding mechanism of claim 1, it is characterized in that The third gears are arranged in two intervals and are arranged on the same side of the second gear.

3. The rack-driven thread-cutting demoulding mechanism according to claim 1, characterized in that : It also includes a gear mounting seat arranged in the mold body, and one side of the gear mounting seat is provided with a straight groove with an axis perpendicular to each other and a first groove with a major arc shape in cross section, and the straight groove and the first groove are connected at the position where the chord of the first groove is located; the rack is installed in the straight groove, and the first gear is installed in the first groove and partially extends into the straight groove to mesh with the rack; the gear mounting seat is provided with a second groove for installing the second gear and a third groove with a major arc shape in cross section for installing the third gear on the back side of the first groove, and the second groove and the third groove are connected at the position where the chord of the third groove is located; the second gear is installed in the second groove, and the third gear is installed in the third groove and partially extends into the second groove to mesh with the second gear; the bottom of the second groove is provided with a first through hole connecting the first groove and the second groove, and a rotating shaft is installed in the first through hole, and the first gear and the second gear are installed on the rotating shaft.

4. The rack-driven thread-cutting demoulding mechanism according to claim 3 is characterized in that : The bottom of the second groove is flush with the bottom of the third groove, and the bottom of the straight groove is flush with the bottom of the first groove.

5. The rack-driven thread-cutting demoulding mechanism according to claim 1, characterized in that : The modules of the rack, the first gear, the second gear and the third gear are the same.

6. The rack-driven thread-cutting demoulding mechanism according to claim 1, characterized in that The rack and the piston rod of the oil cylinder are detachably connected.

7. The rack-driven thread-cutting demoulding mechanism according to claim 6, characterized in that The front end of the oil cylinder piston rod is threadedly connected with a connecting piece, and the end of the connecting piece away from the piston rod is provided with a T-shaped bayonet, and the end of the rack extends with a locking head that matches and engages in the bayonet.

8. A rack-driven thread cutting die, characterized in that : comprising a thread-cutting demoulding mechanism as described in any one of claims 1 to 7.

Images