A structure for reducing the risk of thread breakage of a coring column

Abstract

The utility model discloses a structure capable of reducing the risk of corrugated column thread fracture, comprising a corrugated column, wherein the front end of the corrugated column is connected to a middle plate, the rear end of the corrugated column is connected to a head plate, the head plate is provided with a locking piston sleeved on the outside of the corrugated column, the outer surface of the corrugated column is provided with a first thread, the first thread comprises a plurality of first teeth, the interval between adjacent first teeth is a tooth groove, the inner surface of the locking piston is provided with a second thread for connecting with the first thread, the second thread comprises at least three load-reducing teeth, and the load-reducing teeth closer to the middle plate have a smaller height along the radial direction of the locking piston, so that when the thread is connected, the contact area between the first thread closer to the middle plate and the load-reducing teeth is smaller, thereby reducing the pressure borne by the first thread close to the middle plate, and the pressure borne by the first thread is evenly distributed to each first tooth, so as to avoid the situation where the first tooth close to the middle plate is broken due to excessive bearing pressure.

Description

Technical Field

[0001] The utility model relates to the field of injection molding machines, in particular to a structure for reducing the risk of thread breakage of a coring column. Background Art

[0002] Two-plate injection molding machines usually include a middle plate and a head plate. The middle plate and the head plate are connected by a coring post. An upper mold and a lower mold are arranged between the head plate and the middle plate. The head plate is provided with a mold locking piston. The head plate is threadedly connected to the coring post through the mold locking piston, which constitutes an important part of the mold locking process of the injection molding machine. The working principle of the two-plate injection molding machine is to drive the middle plate to move toward the head plate through the coring post to achieve the mold closing of the upper mold and the lower mold, and then the injection molding machine is locked and injection molding is performed between the upper mold and the lower mold. During the installation of the coring post, the coring post may be eccentric in the installation position of the middle plate and the head plate, which may cause the coring post to be easily broken due to radial stress during movement. In addition, during the high-pressure process of the injection molding machine, the middle plate and the head plate will be subjected to greater pressure. Because the mold locking piston is threadedly connected to the coring post, the pressure of the high-pressure oil will be transmitted to the coring post thread through the mold locking piston, causing the coring post thread to be easily broken.

[0003] For example, a Chinese patent with the announcement number CN114889071A discloses a synchronous brake mechanism for a two-plate injection molding machine, including a booster template and a fixed template. The booster template and the fixed template are connected at four corners by a coring column. The booster template is provided with a locking piston. The outer circumference of the coring column is evenly distributed with six groups of first locking teeth. The inner wall of the locking piston is evenly distributed with six groups of second locking teeth. The coring column and the locking piston are threadedly connected by the first locking teeth and the second locking teeth. The above-mentioned synchronous brake mechanism for a two-plate injection molding machine has the following problems: during the installation of the coring column, there may be a situation where the coring column is eccentric in the booster template and the booster template, which leads to the coring column being easily broken by radial stress during movement. Moreover, during the injection molding process, the fixed template and the booster template will be subjected to greater pressure. Because the locking piston is threadedly connected to the coring column, in particular, the first locking teeth closer to the fixed template are subjected to more pressure, and the first locking teeth closer to the fixed template are more likely to break. In view of this, the utility model proposes a structure for reducing the risk of thread breakage of a coring post to solve the above-mentioned problem. Utility Model Content

[0004] The utility model overcomes the shortcomings of the above-mentioned technology and provides a structure that reduces the risk of thread breakage of a coring column.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A structure for reducing the risk of corrugated column thread breakage, comprising a corrugated column, a front end of the corrugated column connected to a middle plate, a rear end of the corrugated column connected to a head plate, the head plate being provided with a locking piston sleeved on the outside of the corrugated column, an outer surface of the corrugated column being provided with a first thread, the first thread comprising a plurality of first teeth, the gap between adjacent first teeth being a tooth groove, an inner surface of the locking piston being provided with a second thread for connecting to the first thread, the second thread comprising at least three load-reducing teeth, and the closer the load-reducing teeth are to the middle plate, the smaller their radial height along the locking piston, and the load-reducing teeth of the middle plate have a radial height along the locking piston that is less than the depth of the tooth groove.

[0007] Preferably, the second thread includes at least two locking teeth, the locking teeth are located behind the load-reducing teeth, the radial height of the locking teeth along the locking piston is greater than the radial height of the load-reducing teeth along the Coring column, and the number of the first teeth is the sum of the number of the locking teeth and the number of the load-reducing teeth.

[0008] Preferably, the second thread comprises three load-relief teeth and three clamping teeth.

[0009] Preferably, the top of the first tooth is a first chamfer, and when the first thread is connected to the second thread, there is a gap d1 between the first chamfer and the outer surface of the locking piston.

[0010] Preferably, the gap d1 is 2 mm.

[0011] Preferably, the top of the locking tooth is a second chamfer, and when the first thread is connected to the second thread, there is a gap d2 between the second chamfer and the outer surface of the coring column.

[0012] Preferably, the top of the load-reducing tooth is a third chamfer, and in a cross section along the radial direction of the locking piston, the third chamfer is inclined relative to the axial direction of the locking piston.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The outer surface of the coring column is provided with a first thread, and the inner surface of the locking piston is provided with a second thread. During the injection molding process, the middle plate and the head plate will be subjected to greater pressure. Because the head plate is threadedly connected to the coring column through the locking piston, the second thread will exert pressure on the first thread, especially the first thread closer to the middle plate will be subjected to greater pressure. The second thread of the utility model includes at least three load-reducing teeth, and the load-reducing teeth closer to the middle plate have a smaller height along the radial direction of the locking piston. When the threads are connected, the contact area between the first thread closer to the middle plate and the load-reducing teeth is smaller, thereby reducing the pressure on the first thread close to the middle plate, so that the pressure borne by the first thread is evenly distributed to each first tooth, avoiding the situation where the first tooth close to the middle plate is broken due to excessive bearing pressure.

[0015] 2. When the first thread is connected to the second thread, the load-reducing teeth are placed in the tooth grooves, the height of the load-reducing teeth along the radial direction of the locking piston is less than the depth of the tooth grooves, there is a gap between the load-reducing teeth and the tooth grooves, and there is a gap between the top of the first tooth and the outer surface of the locking piston. The two ends of the Corinthian column are respectively connected to the middle plate and the head plate. When the connecting line of the two connection positions deviates from the axis of the Corinthian column, the Corinthian column will be subjected to radial stress during movement, causing the Corinthian column to shake radially. The gap between the load-reducing teeth and the tooth grooves, and the gap between the top of the first tooth and the outer surface of the locking piston can avoid the wear caused by contact with the locking piston when the Corinthian column shakes radially, making the installation of the Corinthian column more fault-tolerant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial cross-sectional view of the two-platen injection molding machine of the utility model;

[0017] Figure 2 yes Figure 1 An enlarged schematic diagram of point A;

[0018] Figure 3 It is a cross-sectional view of the Corinthian column of the utility model;

[0019] Figure 4 yes Figure 3 An enlarged schematic diagram of point B;

[0020] Figure 5 It is a cross-sectional view of the mold locking piston of the utility model;

[0021] Figure 6 yes Figure 5 An enlarged schematic diagram of point C;

[0022] The implementation, functional features and advantages of the present invention will be further described in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following examples further illustrate the features of the present invention and other related features to facilitate understanding by those skilled in the art:

[0024] Reference Figure 1-6 , an embodiment of the structure of the utility model for reducing the risk of thread breakage of a Corinthian column is proposed:

[0025] A structure capable of reducing the risk of thread breakage of a corrugated column comprises a corrugated column 1, the front end of the corrugated column 1 is connected to a middle plate 3, and the rear end of the corrugated column 1 is connected to a head plate 2. The head plate 2 is provided with a locking piston 4 sleeved on the outside of the corrugated column 1, and the outer surface of the corrugated column 1 is provided with a first thread 10, the first thread 10 includes a plurality of first teeth 11, and the gap between adjacent first teeth 11 is a tooth groove. The inner surface of the locking piston 4 is provided with a second thread 40, the second thread 40 includes at least three load-reducing teeth 41, and the closer the load-reducing teeth 41 are to the middle plate 3, the smaller their height h1 along the radial direction of the locking piston 4, and the height h1 is less than the depth h2 of the tooth groove.

[0026] When the first thread 10 is connected with the second thread 40, the load-reducing tooth 41 is placed in the tooth groove, and the injection molding machine realizes mold locking. After the mold is locked, the injection molding machine performs injection molding. Since the mold of the injection molding machine is set between the middle plate 3 and the head plate 2, the head plate 2 and the middle plate 3 will be subjected to greater pressure during the injection molding process. The pressure on the head plate 2 will be applied to the first thread 10 through the second thread 40, especially the first tooth 11 closer to the middle plate 3 will be subjected to greater pressure. The second thread 40 of the utility model includes at least three load-reducing teeth 41, and the load-reducing teeth 41 closer to the middle plate 3 have a smaller height h1 along the radial direction of the mold locking piston 4. When the thread is connected, the contact area between the first thread 10 closer to the middle plate 3 and the load-reducing teeth 41 is smaller, thereby reducing the pressure on the first thread 10 close to the middle plate 3, so that the pressure on the first thread 10 is evenly distributed to each first tooth 11, avoiding the situation where the first tooth 11 close to the middle plate 3 is broken due to excessive bearing pressure.

[0027] like Figure 6 As shown, the second thread 40 includes at least two locking teeth 42, the locking teeth 42 are located behind the load-reducing teeth 41, the number of the first teeth 11 is the sum of the number of the locking teeth 42 and the number of the load-reducing teeth 41, the height h3 of the locking teeth 42 along the radial direction of the locking piston 4 is greater than the height h1 of the load-reducing teeth 41 along the radial direction of the coring column 1, and the locking teeth 42 are used to strengthen the connection between the coring column 1 and the locking piston 4. The number of teeth of the first teeth 11 and the second thread 40 increases at the same time, and the increase in the number of first teeth 11 can reduce the pressure borne by each first tooth 11.

[0028] In the prior art, the first thread has at least six first teeth of the same size. If the second thread has locking teeth 42 of the same size, the load borne by the first six first teeth close to the middle plate 3 is 78% of the load borne by the first thread, and the load borne by the first tooth closest to the middle plate 3 is 34% of the load borne by the first thread. In this embodiment, the second thread 40 includes three load-reducing teeth 41 and three locking teeth 42, and the first thread 10 is provided with six first teeth 11. By reducing the contact area between the load-reducing teeth 41 and the first teeth 11, the load borne by the first teeth 11 close to the middle plate 3 is reduced, and the load borne by the first thread 10 is evenly distributed to each first tooth 11, thereby avoiding the situation where the first teeth 11 close to the middle plate 3 are broken due to excessive bearing pressure.

[0029] Since the two ends of the corrugated column 1 are connected to the middle plate 3 and the head plate 2 respectively, it is difficult to ensure that the two connection positions completely coincide with the axis of the corrugated column 1. When the connection line of the two connection positions deviates from the axis of the corrugated column 1, the corrugated column 1 will be subjected to radial stress during the movement, thereby causing the corrugated column 1 to shake in the radial direction. The top of the first tooth 11 of the utility model is the first chamfer 12, and the top of the clamping tooth 42 is the second chamfer 421. Figure 2 As shown, when the first thread 10 is connected with the second thread 40, there is a gap d1 between the first chamfer 12 and the outer surface of the locking piston 4, there is a gap d2 between the second chamfer 421 and the outer surface of the coring column 1, and there is a gap between the load-reducing teeth 41 and the tooth grooves, which can avoid the coring column 1 from contacting with the locking piston 4 and causing wear when it shakes radially, making the installation of the coring column 1 more fault-tolerant.

[0030] Specifically, the gap d1 cannot be too large, otherwise it will affect the stability of the connection between the coring column 1 and the locking piston 4. The gap d1 cannot be too small, otherwise the installation tolerance of the coring column 1 will not be significantly improved. Therefore, the best gap d1 is 2 mm.

[0031] like Figure 6 As shown, the top of the load-reducing tooth 41 is the third chamfer 411. In the radial cross-section along the locking piston 4, the second chamfer 421 is parallel to the axial direction of the locking piston 4, and the third chamfer 411 is inclined relative to the axial direction of the locking piston 4. The inclination angles of the third chamfers 411 of all load-reducing teeth 41 relative to the axial direction of the locking piston 4 are consistent, so that the contact area between all load-reducing teeth 41 and the first teeth 11 gradually decreases from the front to the rear, which is further beneficial for the first thread 10 to evenly distribute the load to each first tooth 11.

[0032] Specifically, in the cross section along the radial direction of the Corinthian column 1 , the first chamfer 12 is parallel to the axial direction of the Corinthian column 1 .

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A structure for reducing the risk of thread breakage of a coring column, characterized in that: The invention comprises a corrugated column (1), wherein the front end of the corrugated column (1) is connected to a middle plate (3), the rear end of the corrugated column (1) is connected to a head plate (2), the head plate (2) is provided with a locking piston (4) which is sleeved on the outside of the corrugated column (1), the outer surface of the corrugated column (1) is provided with a first thread (10), the first thread (10) comprises a plurality of first teeth (11), the gap between adjacent first teeth (11) is a tooth groove, the inner surface of the locking piston (4) is provided with a second thread (40) for connecting with the first thread (10), the second thread (40) comprises at least three load-reducing teeth (41), and the closer the load-reducing teeth (41) are to the middle plate (3), the smaller their radial height h1 along the locking piston (4), and the height h1 is less than the depth h2 of the tooth groove.

2. A structure for reducing the risk of thread breakage of a coring post according to claim 1, characterized in that: The second thread (40) comprises at least two mold-locking teeth (42), the mold-locking teeth (42) are located behind the load-reducing teeth (41), the height h3 of the mold-locking teeth (42) along the radial direction of the mold-locking piston (4) is greater than the height h1 of the load-reducing teeth (41) along the radial direction of the coring column (1), and the number of the first teeth (11) is the sum of the number of the mold-locking teeth (42) and the number of the load-reducing teeth (41).

3. A structure for reducing the risk of thread breakage of a coring post according to claim 2, characterized in that: The second thread (40) comprises three load-reducing teeth (41) and three mold-locking teeth (42).

4. The structure for reducing the risk of thread breakage of a coring post according to claim 1, characterized in that: The top of the first tooth (11) is a first chamfer (12). When the first thread (10) is connected to the second thread (40), a gap d1 exists between the first chamfer (12) and the outer surface of the locking piston (4).

5. A structure for reducing the risk of thread breakage of a coring post according to claim 4, characterized in that: The gap d1 is 2 mm.

6. A structure for reducing the risk of thread breakage of a coring post according to claim 2, characterized in that: The top of the locking tooth (42) is a second chamfer (421), and when the first thread (10) is connected to the second thread (40), a gap d2 exists between the second chamfer (421) and the outer surface of the coring column (1).

7. The structure for reducing the risk of thread breakage of a coring post according to claim 1, characterized in that: The top of the load-reducing tooth (41) is a third chamfer (411), and in a radial cross section of the mold locking piston (4), the third chamfer (411) is inclined relative to the axial direction of the mold locking piston (4).

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