Injection mold for broom head automatic thread super-wall-thickness product

Abstract

The utility model provides a broom head automatic thread super-wall-thickness product injection mold, which comprises a lower mold and an upper mold, a cavity is formed between the lower mold and the upper mold, a separation mechanism is arranged on the lower mold, the separation mechanism comprises a rack, a mandrel and a guide rod, the mandrel is sleeved on the guide rod, and a first external thread is arranged on the side wall of the upper end of the mandrel; the side wall of the lower end of the mandrel is provided with a second external thread which is the same as the first external thread in rotating direction and equal to the first external thread in thread pitch. The lower die is internally provided with an internal thread in threaded connection with the second external thread. The rack is arranged in the lower die in a sliding fit mode, meshed with a driven gear installed on the side wall of the mandrel and capable of driving the mandrel to rotate, and a driving air cylinder connected with the rack and used for driving the rack to move is arranged on the side wall of the lower die. The automatic threaded super-wall-thickness product injection mold for the broom head is compact in structure, reliable and stable in operation, high in thread separation efficiency and good in effect, and the product quality reliability is greatly improved.

Description

Technical Field

[0001] The utility model relates to a mould, in particular to an injection mould for a broom head with automatic thread and super-thick wall. Background Art

[0002] A broom is the most common tool for daily life at home and at work, and includes a broom head, a broom rod and a handle assembly. The broom head and handle of a traditional broom are made of plastic and are connected to a wooden or stainless steel broom rod by threads. The broom head and handle are made of plastic injection molding and have threaded holes. The dethreading mechanism of the injection mold in the prior art has a complex structure and high manufacturing cost. At the same time, it will generate a certain axial thrust on the product, affecting the product quality. Utility Model Content

[0003] Technical issues to be solved

[0004] The technical problem to be solved by the utility model is to provide an injection mold for a broom head with automatic thread and super-thick wall, which has the advantages of compact structure, low manufacturing cost, good use effect and high product quality.

[0005] Technical solutions to the problem

[0006] The utility model provides an injection mold for a broom head automatic threaded super-thick product, comprising a lower mold and an upper mold vertically slidably mounted above the lower mold, a cavity is formed between the lower mold and the upper mold, the lower mold is provided with a disengagement mechanism for threading the product in the cavity, the disengagement mechanism comprises a rack 32, a core shaft 51 and a guide rod 56, the guide rod 56 is fixed in the lower mold, the core shaft 51 is sleeved on the guide rod 56 and can realize radial rotation and axial movement, the upper end of the core shaft 51 extends to the cavity And as a thread forming part, the side wall of the thread forming part is provided with a first external thread for product thread forming; the lower end side wall of the core shaft 51 is provided with a second external thread with the same rotation direction and equal pitch as the first external thread, and the lower mold is provided with an internal thread threadedly connected to the second external thread; the rack 32 is slidably fitted in the lower mold, and is meshed with the driven gear 52 installed on the side wall of the core shaft 51 and can drive the core shaft to rotate, and the side wall of the lower mold is provided with a driving cylinder 33 connected to the rack 32 and used to drive it to move.

[0007] Furthermore, it also includes an intermediate gear 41 parallel to the core shaft 51 , the intermediate gear 41 is rotatably installed in the lower mold and is simultaneously meshed with the plurality of driven gears 52 , and the rack 32 is meshed with the intermediate gear 41 .

[0008] Furthermore, the intermediate gear 41 includes a first gear segment 411 and a second gear segment 412 which are coaxially arranged, the number of teeth of the first gear segment 411 is greater than the number of teeth of the second gear segment 412, the first gear segment 411 is meshed with the driven gear 52, and the second gear segment 412 is meshed with the rack.

[0009] Furthermore, an upper sleeve 53 and a lower sleeve 54 coaxial with the guide rod 56 are provided in the lower die, the core shaft 51 is sleeved in the upper sleeve 53 and the lower sleeve 54 , and the driven gear 52 is located between the upper sleeve 53 and the lower sleeve 54 .

[0010] Furthermore, a threaded seat 55 and a limiting block 57 for radially limiting the threaded seat 55 are provided at the lower end of the lower die, and screw holes connected to the second external thread are penetrated at both ends of the threaded seat 55 .

[0011] Furthermore, the cross section of the threaded seat 55 is circular, and the side wall of the threaded seat 55 is provided with one or more notches 551 , and the limiting block 57 is clamped in the notch to achieve radial limiting.

[0012] Furthermore, the core shaft 51 includes a first shaft body 511, a second shaft body 512 and a third shaft body 514 connected in sequence, the first external thread 5111 is opened at the end of the first shaft body, the second external thread is opened on the third shaft body 514, and the driven gear 52 is installed on the second shaft body 512.

[0013] Furthermore, the side wall of the first shaft body 511 is an inclined surface, and the angle between the inclination of the inclined surface and the axis is greater than or equal to 0.2° and less than or equal to 0.5°.

[0014] Furthermore, the driven gear 52 is mounted on the second shaft 512 via a key, and both ends of the driven gear 52 are respectively in contact with a stepped shaft 513 and a retaining spring to achieve axial limiting.

[0015] Furthermore, a mounting seat 31 is provided on the side wall of the lower mold, a strip-shaped mounting groove is provided on the mounting seat 31, the rack is slidably fitted in the mounting groove, a contact block 321 is provided on the rack 32, and a contact switch 34 that can be triggered by the contact block 321 is provided on the mounting seat 31. There are two contact switches 34 and they are respectively arranged at the two limit positions of the rack, and the driving cylinder 33 is fixed at the end of the mounting seat 31.

[0016] Beneficial Effects

[0017] The utility model discloses an injection mold for a broom head with automatic thread and super-thick wall product, and a second thread is arranged at the lower end of the core shaft, which can realize radial rotation and axial movement, greatly improve the efficiency and effect of thread disengagement, avoid axial force on the product, and improve product quality; an intermediate gear is arranged to realize simultaneous meshing of multiple core shafts, thereby realizing simultaneous molding and disengagement of multiple products, which is efficient and convenient to reduce the overall volume; a stepped intermediate gear is adopted, which can realize synchronous meshing of multiple core shafts, and at the same time can reduce the structural volume and improve the compactness of the structure, and has a transmission ratio, reduces the rack length and the cylinder stroke, and further reduces the overall volume; a split structure design is adopted, which is convenient for production and processing, has high processing precision, low manufacturing cost and convenient assembly; the utility model discloses an injection mold for a broom head with automatic thread and super-thick wall product, which has a compact structure, reliable and stable operation, high thread disengagement efficiency and good effect, and greatly improves the reliability of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of the injection mold for the automatic threaded super-thick wall product of the broom head of the utility model;

[0019] Figure 2 It is a cross-sectional view of the injection mold of the broom head automatic thread super-thick product of the utility model;

[0020] Figure 3 It is a schematic diagram of the installation of the disengagement mechanism of the injection mold of the automatic threaded super-thick wall product of the broom head of the utility model;

[0021] Figure 4 It is a schematic diagram of the internal structure of the disengagement mechanism of the injection mold of the automatic thread super-thick wall product of the broom head of the utility model;

[0022] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0023] Figure 6 It is a structural schematic diagram of the disengagement mechanism of the injection mold of the automatic thread super-thick wall product of the broom head of the utility model;

[0024] Figure 7 It is a structural schematic diagram from another angle of the disengagement mechanism of the injection mold of the automatic threaded super-thick wall product of the broom head of the utility model;

[0025] Figure 8 It is a cross-sectional view of the disengagement mechanism of the injection mold of the automatic thread super-thick wall product of the broom head of the utility model. DETAILED DESCRIPTION

[0026] The following is a detailed description of the embodiments of the present utility model in conjunction with the accompanying drawings.

[0027] See also Figure 1-Figure 8The utility model provides an injection mold for an automatic threaded super-thick product of a broom head, comprising a lower mold and an upper mold. The upper mold is vertically slidably fitted above the lower mold, and can realize mold closing and mold separation. A cavity is formed between the lower mold and the upper mold for injection molding products. In this embodiment, the lower mold comprises a lower mold base 21, a lower mold plate 22 and a lower mold frame 23 which are arranged in sequence from bottom to top. A mounting recess is provided on the top surface of the lower mold frame 23, and a lower mold core 24 is arranged in the mounting recess. A molding cavity, namely, a lower cavity, is provided on the upper top surface of the lower mold core 24; the upper mold comprises an upper mold base 11, an upper mold plate 12 which are arranged in sequence from top to bottom. And an upper mold frame 13, a mounting recess is provided on the bottom surface of the upper mold frame 13, an upper mold core 14 is installed in the mounting recess, a molding cavity, i.e., an upper cavity, is provided on the bottom surface of the upper mold core, the upper cavity and the lower cavity can be molded together to form a complete cavity, in this embodiment, the cavity includes a plurality of sub-cavities, and a plurality of products can be injected at the same time, with high production efficiency; in this application, the upper mold core and the lower mold core are made of special steel, which itself has dense and fine air holes with a hole diameter of 0.025mm-0.035mm, which can realize rapid ventilation and heat conduction, and greatly improve the injection molding efficiency of the product.

[0028] In the present application, a disengagement mechanism is provided on the lower mold, which is used for thread forming and disengaging the product in the cavity. The disengagement mechanism includes a rack 32, a core shaft 51 and a guide rod 56. The guide rod 56 is vertically fixed in the lower mold. Center holes are opened at both ends of the core shaft, and it is sleeved on the guide rod 56 through the center hole. The core shaft 51 is coaxial with the guide rod and can realize radial rotation and axial movement. The upper end of the core shaft 51 extends into the cavity as a thread forming part. The cross-section of the thread forming part is circular. A first external thread is provided on the side wall of the thread forming part, which is used for forming the threaded hole of the product; a second external thread is provided on the side wall of the lower end of the core shaft 51. The second external thread has the same rotation direction and the same pitch as the first external thread. At the same time, an internal thread (hole) is provided in the lower mold, which is threadedly connected to the second external thread, and a driven gear 52 is fixed on the side wall of the core shaft.

[0029] The rack 32 is slidably fitted in the lower die. The rack is horizontally arranged, and its sliding direction is perpendicular to the axis of the core shaft. The rack 32 is meshed with the driven gear 52. The sliding of the rack 32 can drive the driven gear 52 to rotate, thereby driving the core shaft 51 to rotate. Under the action of the second external thread, the core shaft 51 produces axial movement along with the thread during rotation, so that the first thread at the upper end is disengaged from the screw hole of the product. In this process, no axial force is generated on the product, and the product quality is high. A driving cylinder 33 is provided on the side wall of the lower die. The output end of the driving cylinder 33 is connected to the rack 32 for driving the rack to move, and it serves as the power input end of the disengagement mechanism.

[0030] In the present embodiment, one sub-cavity corresponds to one core shaft (first external thread). Since the sub-cavity is composed of multiple sub-cavities, it has multiple core shafts, and the multiple core shafts can realize synchronous rotation. Therefore, an intermediate gear 41 is also included. The intermediate gear 41 is parallel to the core shaft 51 and is rotatably installed in the lower mold. The intermediate gear 41 is simultaneously engaged with multiple driven gears 52, and the rack 32 is engaged with the intermediate gear 41. The rack moves and passes through the intermediate gear to realize synchronous rotation of multiple core shafts; preferably, one intermediate gear engages with two core shafts (driven gears).

[0031] See also Figure 6-Figure 7 The intermediate gear 41 includes a first gear segment 411 and a second gear segment 412, which are coaxially arranged and rigidly connected. Gear teeth are provided on the side walls of the first gear segment and the second gear segment. At the same time, the number of teeth of the first gear segment 411 is greater than the number of teeth of the second gear segment 412. The first gear segment 411 is meshed with the driven gear 52, and the second gear segment 412 is meshed with the rack. It can increase the transmission ratio and reduce the rack stroke while meshing multiple spindles (driven gears), making the structure more compact and thus reducing the overall volume.

[0032] The intermediate gear and driven gear are both spur gears, which can realize axial movement while realizing radial drive.

[0033] To facilitate assembly, an upper sleeve 53 and a lower sleeve 54 are provided in the lower mold. Both the upper sleeve 53 and the lower sleeve 54 are cylindrical, and a step surface is provided on their side walls for axial limitation. The upper sleeve is installed at the upper end and the lower sleeve is installed at the lower end. They are coaxial with the guide rod. Specifically, the guide rod passes through the lower sleeve and the upper sleeve in sequence from bottom to top, which is used to improve the stability and reliability of the rotation and movement of the core shaft and avoid displacement and deformation caused by radial force. The driven gear 52 is located between the upper sleeve 53 and the lower sleeve 54.

[0034] See also Figure 8 A threaded seat 55 and a limiting block 57 are provided at the lower end of the lower die. The threaded seat is cylindrical as a whole, and a step surface is provided on its side wall for axial limiting. The threaded seat is coaxial with the core shaft. Screw holes are penetrated at both ends of the threaded seat 55. The screw holes are connected to the second external thread to realize the up and down movement of the core shaft. The limiting block 57 is used to radially limit the threaded seat 55. Specifically, one or more notches 551 are provided on the side wall of the threaded seat 55. At the same time, the limiting block 57 is clamped in the notch, thereby realizing radial limiting of the multi-threaded seat, which can withstand a certain radial force and improve the rotation stability and reliability of the core shaft.

[0035] In the present application, the core shaft 51 includes a first shaft body 511, a second shaft body 512 and a third shaft body 514 connected in sequence from top to bottom, a first external thread 5111 is provided at the end of the first shaft body, a second external thread is provided on the third shaft body 514, and the driven gear 52 is installed on the second shaft body 512. In this embodiment, the side wall of the first shaft body 511 is an inclined surface, the diameter of the upper end thereof is smaller than the diameter of the lower end, and the angle between the inclination of the side wall of the first shaft body and the axis (of the first shaft body) is greater than or equal to 0.2° and less than or equal to 0.5°, which can improve the efficiency and effect of thread disengagement and improve product quality and reliability; the driven gear 52 is installed on the second shaft body 512 by a key, and the two ends of the driven gear 52 are respectively in contact with a step shaft 513 and a retaining spring to achieve axial limitation. The step shaft is an annular protrusion provided on the side wall of the second shaft body, which is used to limit the installation of the driven gear and realize axial limitation of the core shaft, that is, to limit the upper limit position of the first external thread.

[0036] See also Figure 4-Figure 5 A mounting seat 31 is provided on the side wall of the lower mold, and the mounting seat is horizontally arranged. A strip-shaped mounting groove is provided on the mounting seat 31, and a rack is slidably fitted in the mounting groove. A contact block 321 is provided on the rack 32. At the same time, a contact switch 34 is provided on the mounting seat 31, and the contact switch 34 can be triggered by the contact block 321. There are two contact switches 34, which are respectively arranged at the two limit positions (inner limit position and outer limit position) of the rack, and the two limit positions correspond to the upper limit position and the lower limit position of the core shaft respectively; a driving cylinder 33 is fixed at the end of the mounting seat 31, and the output end of the driving cylinder is connected to the rack, which is used to drive the rack to move horizontally, thereby causing the core shaft to rotate and move axially.

[0037] The utility model discloses an injection mold for a broom head with automatic thread and super-thick wall product, and a second thread is arranged at the lower end of the core shaft, which can realize radial rotation and axial movement, greatly improve the efficiency and effect of thread disengagement, avoid axial force on the product, and improve product quality; an intermediate gear is arranged to realize simultaneous meshing of multiple core shafts, thereby realizing simultaneous molding and disengagement of multiple products, which is efficient and convenient to reduce the overall volume; a stepped intermediate gear is adopted, which can realize synchronous meshing of multiple core shafts, and at the same time can reduce the structural volume and improve the compactness of the structure, and has a transmission ratio, reduces the rack length and the cylinder stroke, and further reduces the overall volume; a split structure design is adopted, which is convenient for production and processing, has high processing precision, low manufacturing cost and convenient assembly; the utility model discloses an injection mold for a broom head with automatic thread and super-thick wall product, which has a compact structure, reliable and stable operation, high thread disengagement efficiency and good effect, and greatly improves the reliability of product quality.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An injection mold for automatic threaded broom heads with ultra-thick wall, characterized by: The invention comprises a lower die and an upper die which is vertically slidably mounted above the lower die, a cavity being formed between the lower die and the upper die, a disengagement mechanism being provided on the lower die for threadingly disengaging the product in the cavity, the disengagement mechanism comprising a rack, a core shaft and a guide rod, the guide rod being fixed in the lower die, the core shaft being sleeved on the guide rod and being capable of radial rotation and axial movement, the upper end of the core shaft extending into the cavity and serving as a thread forming part, the side wall of the thread forming part being provided with a first external thread for thread forming of the product; the side wall of the lower end of the core shaft being provided with a second external thread which has the same rotation direction and the same pitch as the first external thread, and the lower die being provided with an internal thread which is threadably connected to the second external thread; the rack being slidably mounted in the lower die, and meshing with a driven gear mounted on the side wall of the core shaft and being capable of driving the core shaft to rotate, and the side wall of the lower die being provided with a driving cylinder which is connected to the rack and is used to drive it to move.

2. The injection mold for the broom head automatic thread super-thick product according to claim 1, characterized in that: It also includes an intermediate gear parallel to the core shaft. The intermediate gear is rotatably installed in the lower mold and is simultaneously meshed with a plurality of the driven gears. The rack is meshed with the intermediate gear.

3. The injection mold for the broom head automatic thread super-thick product according to claim 2, characterized in that: The intermediate gear includes a first gear segment and a second gear segment that are coaxially arranged, the number of teeth of the first gear segment is greater than the number of teeth of the second gear segment, the first gear segment is meshed with the driven gear, and the second gear segment is meshed with the rack.

4. The injection mold for the broom head automatic thread super-thick product according to claim 1, characterized in that: An upper sleeve and a lower sleeve coaxial with the guide rod are arranged in the lower die, the core shaft is sleeved in the upper sleeve and the lower sleeve, and the driven gear is located between the upper sleeve and the lower sleeve.

5. The injection mold for the broom head automatic thread super-thick product according to claim 1, characterized in that: A threaded seat and a limiting block for radially limiting the threaded seat are provided at the lower end of the lower die, and screw holes connected to the second external thread are penetrated at both ends of the threaded seat.

6. The injection mold for the broom head automatic thread super-thick product as claimed in claim 5, characterized in that: The cross section of the threaded seat is circular, and the side wall of the threaded seat is provided with one or more notches. The limiting block is clamped in the notches to achieve radial limiting.

7. The injection mold for the broom head automatic thread super-thick product according to claim 1, characterized in that: The core shaft includes a first shaft body, a second shaft body and a third shaft body which are connected in sequence, the first external thread is provided at the end of the first shaft body, the second external thread is provided on the third shaft body, and the driven gear is installed on the second shaft body.

8. The injection mold for the broom head automatic thread super-thick product according to claim 7, characterized in that: The side wall of the first shaft body is an inclined surface, and the angle between the inclination of the inclined surface and the axis is greater than or equal to 0.2° and less than or equal to 0.5°.

9. The injection mold for the broom head automatic thread super-thick product according to claim 7, characterized in that: The driven gear is mounted on the second shaft body through a key, and two ends of the driven gear are respectively in contact with a stepped shaft and a retaining spring to achieve axial limiting.

10. The injection mold for the broom head automatic thread super-thick product according to claim 1, characterized in that: The side wall of the lower mold is provided with a mounting seat, the mounting seat is provided with a strip-shaped mounting groove, the rack is slidably fitted in the mounting groove, the rack is provided with a contact block, the mounting seat is provided with a contact switch that can be triggered by the contact block, the contact switches are two and are respectively arranged at the two limit positions of the rack, and the driving cylinder is fixed to the end of the mounting seat.

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