Upper die of gland die for plastic bottle cap

Abstract

An upper die of a cap pressing die for a plastic bottle cap comprises an outer sleeve, a cooling liquid pipeline, a male die and a positioning push sleeve. The cooling liquid pipeline comprises an inner pipe and an outer pipe, the outer pipe comprises an upper outer pipe and a lower outer pipe, and the lower outer pipe comprises a pipe body and a connecting part with the section larger than that of the pipe body; the male die comprises a thread forming piece in sliding sealing fit with the inner side wall of the positioning push sleeve and a U-shaped sealing structure forming piece arranged outside the connecting part in a sleeving mode. The thread forming piece comprises a first limiting part, a forming part and a second limiting part which are arranged from top to bottom, the second limiting part is located on the inner side wall of the first limiting part, and the inner side wall of the forming part is in sliding sealing fit with the outer side wall of the sealing structure forming piece; the lower outer pipe sleeve is provided with a first reset piece with the two ends abutting against the connecting part and the second limiting part correspondingly. A sliding groove is formed in the outer side wall of the outer pipe, and the thread forming piece is provided with a limiting block extending into the sliding groove. Compared with the prior art, the upper die of the gland die is simple in structure, and the problem that the die removal difficulty is large due to bolt connection can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of capping mold upper mold technology, specifically relating to an upper mold for capping molds used for plastic bottle caps. Background Technology

[0002] The existing plastic bottle cap capping mold includes an outer sleeve, a coolant pipe fixed in the center of the outer sleeve, a punch fitted outside the coolant pipe, and a sliding positioning push sleeve located between the punch and the outer sleeve. The coolant pipe includes an inner tube and an outer tube fitted outside the inner tube. For ease of assembly, the outer tube includes an upper outer tube and a lower outer tube that can be sealed together. After assembly, the inner cavity of the inner tube and the gap between the inner and outer tubes form two flow channels. The punch includes a thread forming part for forming a threaded surface and a sealing structure forming part for forming a sealing surface and a structure located on the sealing surface. For easy demolding, the thread forming part is configured to be sliding. The specific structure is as follows:

[0003] An inner sleeve is provided between the positioning push sleeve and the punch, and the inner sleeve is fixed to the outside of the outer tube. The bottom of the inner sleeve 291 extends inward to form a support part 292. A threaded forming part is provided between the coolant pipe and the support part. A spring is fitted on the threaded forming part, and the bottom of the spring abuts against the top surface of the support part. A limit part 293 is fixed to the top of the threaded forming part by bolts. The bottom surface of the limit part abuts against the top surface of the spring, so that the spring is in a compressed state under normal conditions, and the top surface of the limit part is in a limiting fit with the bottom of the upper outer tube. The lower outer tube includes a tube body and a connecting part located at the bottom of the tube body. The cross-sectional dimension of the connecting part is larger than that of the tube body. The sealing structure forming part is U-shaped and is fitted outside the connecting part of the lower outer tube. The sealing structure forming part is in a sealing fit with the connecting part to form a cavity that connects the inner cavity of the inner tube and the gap between the inner tube and the outer tube. When the bottle cap is demolded, the positioning push sleeve pushes the bottle cap, and the bottle cap is demolded under the combined action of the positioning push sleeve, the bottle cap limiting structure and the threaded forming part. In the above structure, the spring is always in a compressed state, whether under normal conditions or during demolding. The bolts between the threaded forming part and the limiting part are easily deformed under pressure, making it difficult to disassemble the bolts during later maintenance, which increases the difficulty of demolding. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an upper mold for capping plastic bottle caps.

[0005] To achieve the above objectives, this utility model discloses an upper mold for a capping mold for plastic bottle caps, including an outer sleeve, a coolant pipe fixed in the center of the outer sleeve, a punch sleeved outside the coolant pipe, and a slidable positioning push sleeve located between the punch and the outer sleeve.

[0006] The coolant pipeline includes an inner pipe and an outer pipe sleeved outside the inner pipe. The outer pipe includes an upper outer pipe and a lower outer pipe that can be sealed together. The lower outer pipe includes a pipe body and a connecting part located at the bottom of the pipe body. The cross-sectional dimension of the connecting part is larger than the cross-sectional dimension of the pipe body.

[0007] The punch includes a threaded forming part and a sealing structure forming part. The sealing structure forming part is U-shaped and is sleeved outside the connecting part, forming a cavity that connects the inner tube and the gap between the inner tube and the outer tube. The inner side wall of the positioning push sleeve slides and seals with the outer side wall of the threaded forming part.

[0008] The threaded forming part includes a first limiting part, a forming part, and a second limiting part. The first limiting part and the forming part are arranged from top to bottom. The top of the first limiting part is limited and matched with the bottom of the upper outer tube. The inner sidewall of the forming part is slidably sealed and matched with the outer sidewall of the sealing structure forming part. The second limiting part is located on the inner sidewall of the first limiting part.

[0009] The lower outer tube is fitted with a first reset member, the bottom surface of the first reset member abuts against the top surface of the connecting part, and the top surface of the first reset member abuts against the bottom of the second limiting part;

[0010] The outer wall of the outer tube is provided with a sliding groove extending in the vertical direction, and the threaded forming part is provided with a limiting block extending into the sliding groove. The limiting block is in a limiting engagement with the inner wall of the sliding groove in the radial direction.

[0011] Preferably, the depth of the groove is greater than the maximum travel of the threaded part.

[0012] Preferably, the threaded forming part has a threaded hole at a position opposite to the slide groove, and a bolt is connected to the threaded hole, with the threaded end of the bolt extending into the slide groove.

[0013] Preferably, the head of the bolt is located inside the threaded hole.

[0014] Preferably, the inner wall of the positioning push sleeve is recessed in the radial direction to form a first receiving groove, and a first ball sleeve is provided in the first receiving groove. The balls on the first ball sleeve contact the inner wall of the positioning push sleeve and the outer wall of the threaded part, respectively.

[0015] Preferably, the inner sidewall of the first limiting part and the top surface of the second limiting part form a second receiving groove, and a second ball sleeve is provided in the second receiving groove. The balls on the second ball sleeve contact the inner sidewall of the first limiting part and the outer sidewall of the lower outer tube, respectively.

[0016] Preferably, the top surface of the connecting part is provided with a limiting sleeve, and a portion of the first reset member is located inside the limiting sleeve.

[0017] Preferably, the outer sleeve is provided with a second reset member for driving the positioning push sleeve to reset.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] The upper mold of this utility model fully utilizes the structural feature that the cross-sectional size of the connecting part of the lower outer tube is larger than that of the tube body. By setting the second limiting part of the threaded forming part on the inner side wall of the first limiting part, the threaded forming part is supported on the head of the lower outer tube through the cooperation of the second limiting part and the first resetting part. Compared with the prior art, which requires setting an inner sleeve and setting a limiting part on the threaded forming part to cooperate with the first resetting part, the structure is simpler. At the same time, since no limiting part is required, the problem of difficult demolding caused by bolt connection is avoided.

[0020] The rotation of the threaded part is restricted by the cooperation between the limiting block and the slide groove on the threaded part, so as to avoid the threaded part being able to rotate and affecting the quality of bottle cap forming. Attached Figure Description

[0021] Figure 1 A front view of a prior art capping mold;

[0022] Figure 2 A cross-sectional view of the capping mold in the embodiment;

[0023] Figure 3 for Figure 2 A sectional view of the upper mold of the medium-pressure cover mold;

[0024] Lower mold 100;

[0025] Upper mold 200;

[0026] Outerwear sleeve 210;

[0027] Coolant pipe 220; inner pipe 221; outer pipe 222; upper outer pipe 223; lower outer pipe 224; pipe body 225; connecting part 226; slide groove 227; limiting sleeve 228;

[0028] Punch 230; Thread forming part 231; Limiting block 232; Sealing structure forming part 233;

[0029] Positioning push sleeve 240;

[0030] First reset component 250;

[0031] First ball bearing sleeve 260;

[0032] Second ball bearing sleeve 270;

[0033] Second reset component 280;

[0034] Inner sleeve 291; support part 292; limiting part 293. Detailed Implementation

[0035] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] See Figure 3 The capping mold includes an upper mold 200 and a lower mold 100. When the mold is closed, the lower mold moves upward to close with the upper mold. The structure of the upper mold is as follows.

[0037] A capping mold upper die for plastic bottle caps, see [link / reference] Figures 2-3 It includes an outer sleeve 210, a coolant pipe 220 fixed in the center of the outer sleeve 210, a punch 230 sleeved outside the coolant pipe 220, and a slidable positioning push sleeve 240 located between the punch 230 and the outer sleeve 210.

[0038] The coolant pipe 220 includes an inner pipe 221 and an outer pipe 222 sleeved outside the inner pipe 221. The outer pipe 222 includes an upper outer pipe 223 and a lower outer pipe 224 that can be sealed together, thus forming two internal flow channels, namely the inner cavity of the inner pipe 221 and the gap between the inner pipe 221 and the outer pipe 222. The lower outer pipe 224 includes a pipe body 225 and a connecting portion 226 located at the bottom of the pipe body 225. The cross-sectional dimension of the connecting portion 226 is larger than the cross-sectional dimension of the pipe body 225.

[0039] The punch 230 includes a threaded forming part 231 and a sealing structure forming part 233. The sealing structure forming part 233 is U-shaped and is sleeved outside the connecting part 226, forming a cavity between the two that connects the inner cavity of the inner tube 221 and the gap between the inner tube 221 and the outer tube 222. Thus, cooling liquid flows in from one flow channel in the inner cavity of the inner tube 221 and the gap between the inner tube 221 and the outer tube 222, flows through the cavity to another flow channel, and finally flows out. The cooling liquid can circulate, improving the cooling effect. The inner wall of the positioning push sleeve 240 slides and seals with the outer wall of the threaded forming part 231.

[0040] The threaded forming part 231 includes a first limiting part, a forming part, and a second limiting part. The first limiting part and the forming part are arranged from top to bottom and are cylindrical in shape. The top of the first limiting part is limited and fitted with the bottom of the upper outer tube 223. The outer side wall of the forming part is used to form the inner thread of the bottle cap. The inner side wall of the forming part is slidably sealed with the outer side wall of the sealing structure forming part 233. The second limiting part is located on the inner side wall of the first limiting part.

[0041] The lower outer tube 224 is fitted with a first reset member 250, which is preferably a spring in this embodiment. The bottom surface of the first reset member 250 abuts against the top surface of the connecting part 226 of the tube body 225, and the top surface of the first reset member 250 abuts against the bottom of the second limiting part. In order to make the assembly of the threaded forming part 231 more stable, the first reset member 250 is always in a compressed state under normal conditions.

[0042] The outer wall of the outer tube 222 is provided with a groove 227 extending in the vertical direction, and the threaded forming part 231 is provided with a limiting block 232 extending into the groove 227. The limiting block 232 is matched with the inner wall of the groove 227 in the radial direction.

[0043] In this embodiment, during the forming process of the upper mold 200 of the capping mold, after the glue is dripped into the forming groove of the lower mold 100, the lower mold 100 moves upward. The positioning structure on the lower mold 100 is positioned and engaged with the positioning push sleeve 240. Then, the lower mold 100 pushes the positioning push sleeve 240 upward until the punch 230 and the forming groove of the lower mold 100 form a cavity to form the bottle cap. After cooling and forming, the lower mold 100 moves upward. The bottle cap is located on the punch 230 of the upper mold 200 due to the thread engagement with the threaded forming part 231. Then, the positioning push sleeve 240 moves downward, and the bottle cap moves downward. At this time, the threaded forming part 231 moves downward as well (at this time, the first reset part 250 is further compressed) until the sealing structure on the bottle cap moves out of the gap between the sealing structure forming part 233 and the threaded forming part 231. The bottle cap is separated from the punch 230. At the same time, the threaded forming part 231 moves upward to the initial position of the first reset part 250. The aforementioned upper mold 200 structure fully utilizes the structural feature that the cross-sectional dimension of the connecting part 226 of the lower outer tube 224 is larger than that of the tube body 225. Furthermore, by placing the second limiting part of the threaded forming part 231 on the inner wall of the first limiting part, the threaded forming part 231 is supported on the head of the lower outer tube 224 through the cooperation of the second limiting part and the first reset part 250. Compared to the prior art, which requires an inner sleeve and a limiting part on the threaded forming part 231 to cooperate with the first reset part 250, the structure is simpler. Moreover, since no limiting part is needed, the problem of difficult demolding due to bolted connections is avoided. The cooperation between the limiting block 232 on the threaded forming part 231 and the slide groove 227 restricts the rotation of the threaded forming part 231, preventing the threaded forming part 231 from rotating and affecting the bottle cap forming quality.

[0044] In this embodiment, the depth of the groove 227 is greater than the maximum travel of the threaded forming part 231. This restricts the rotation of the threaded forming part 231 and prevents interference between the threaded forming part 231 and the bolt limiting block 232.

[0045] Preferably, the threaded forming part 231 has a threaded hole at a position opposite to the slide groove 227, and a bolt is connected to the threaded hole, with the threaded end of the bolt extending into the slide groove 227. The above structure forming the limiting block 232 is simple and easy to manufacture.

[0046] The head of the bolt is located inside the threaded hole, which avoids interference between the bolt and the positioning push sleeve 240, thus preventing the positioning push sleeve 240 from moving.

[0047] In this embodiment, the inner sidewall of the positioning push sleeve 240 is recessed radially to form a first receiving groove. A first ball sleeve 260 is provided in the first receiving groove, and the balls on the first ball sleeve 260 contact the inner sidewall of the positioning push sleeve 240 and the outer sidewall of the threaded forming part 231, respectively. The inner sidewall of the first limiting part and the top surface of the second limiting part form a second receiving groove, and a second ball sleeve 270 is provided in the second receiving groove. The balls on the second ball sleeve 270 contact the inner sidewall of the first limiting part and the outer sidewall of the lower outer tube 224, respectively. By providing the first ball sleeve 260 and the second ball sleeve 270, the smoothness of movement of the positioning push sleeve 240 and the threaded forming part 231 can be improved, and the problem of jamming can be reduced.

[0048] In this embodiment, a limiting sleeve 228 is provided on the top surface of the connecting part 226, and a part of the first reset member 250 is located inside the limiting sleeve 228. The first reset member 250 is restricted inside the limiting sleeve 228, which can improve the stability and reliability of use.

[0049] In this embodiment, the outer sleeve 210 is provided with a second reset member 280 for driving the positioning push sleeve 240 to reset. After the bottle cap is demolded, the second reset member 280 drives the positioning push sleeve 240 to move to the initial position.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A capping mold upper die for plastic bottle caps, comprising an outer sleeve, a coolant pipe fixed at the center position inside the outer sleeve, a punch sleeved outside the coolant pipe, and a slidable positioning push sleeve located between the punch and the outer sleeve; The coolant pipeline includes an inner pipe and an outer pipe sleeved outside the inner pipe. The outer pipe includes an upper outer pipe and a lower outer pipe that can be sealed together. The lower outer pipe includes a pipe body and a connecting part located at the bottom of the pipe body. The cross-sectional dimension of the connecting part is larger than the cross-sectional dimension of the pipe body. The punch includes a threaded forming part and a sealing structure forming part. The sealing structure forming part is U-shaped and is sleeved outside the connecting part, forming a cavity that connects the inner tube and the gap between the inner tube and the outer tube. The inner wall of the positioning push sleeve slides and seals with the outer wall of the threaded forming part. The punch is characterized by: The threaded forming part includes a first limiting part, a forming part, and a second limiting part. The first limiting part and the forming part are arranged from top to bottom. The top of the first limiting part is limited and matched with the bottom of the upper outer tube. The inner sidewall of the forming part is slidably sealed and matched with the outer sidewall of the sealing structure forming part. The second limiting part is located on the inner sidewall of the first limiting part. The lower outer tube is fitted with a first reset member, the bottom surface of the first reset member abuts against the top surface of the connecting part, and the top surface of the first reset member abuts against the bottom of the second limiting part; The outer wall of the outer tube is provided with a sliding groove extending in the vertical direction, and the threaded forming part is provided with a limiting block extending into the sliding groove. The limiting block is matched with the inner wall of the sliding groove in the radial direction.

2. The upper mold for capping plastic bottle caps according to claim 1, characterized in that: The depth of the groove is greater than the maximum travel of the threaded part.

3. The upper mold for capping plastic bottle caps according to claim 1, characterized in that: The threaded part has a threaded hole at a position opposite to the slide groove, and a bolt is connected to the threaded hole, with the threaded end of the bolt extending into the slide groove.

4. The upper mold for capping plastic bottle caps according to claim 3, characterized in that: The head of the bolt is located inside the threaded hole.

5. The upper mold for capping plastic bottle caps according to claim 1, characterized in that: The inner wall of the positioning push sleeve is recessed in the radial direction to form a first receiving groove. A first ball sleeve is provided in the first receiving groove, and the balls on the first ball sleeve contact the inner wall of the positioning push sleeve and the outer wall of the threaded part, respectively.

6. The upper mold for capping plastic bottle caps according to claim 1, characterized in that: The inner sidewall of the first limiting part and the top surface of the second limiting part form a second receiving groove. A second ball sleeve is provided in the second receiving groove, and the balls on the second ball sleeve contact the inner sidewall of the first limiting part and the outer sidewall of the lower outer tube, respectively.

7. The upper mold for capping plastic bottle caps according to claim 1, characterized in that: The top surface of the connecting part is provided with a limiting sleeve, and a part of the first reset member is located inside the limiting sleeve.

8. The upper mold for capping plastic bottle caps according to claim 1, characterized in that: The outer sleeve is provided with a second reset component for driving the positioning push sleeve to reset.

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