Three-composite machine head

Abstract

The utility model discloses a three-composite machine head. The three-composite machine head comprises an upper die body, an upper middle die body, a middle die body, a lower die body, a locking structure, an upper die body turnover mechanism, an upper middle die body turnover mechanism, a lower die body turnover mechanism, a forming mechanism and an inserting device, a first channel is formed between the upper die body and the upper middle die body, a second channel is formed between the upper middle die body and the middle die body, and a third channel is formed between the middle die body and the lower die body; the forming mechanism comprises a first forming runner, a second forming runner, a third forming runner and a converging runner; the first forming runner is communicated with the first channel, the second forming runner is communicated with the second channel, the third forming runner is communicated with the third channel, and the first forming runner, the second forming runner and the third forming runner are converged to a converging runner; in the vertical direction, the minimum size of the section of the converging flow channel is larger than the minimum distance between the first forming flow channel and the third forming flow channel and smaller than the maximum distance between the first forming flow channel and the third forming flow channel. According to the utility model, the upper protective layer, the lower protective layer and the middle honeycomb-shaped support body of the special bulletproof tire body can be compounded and molded at one time.

Description

TECHNICAL FIELD

[0001] The utility model relates to special tire manufacturing technical field especially three compound machine head. BACKGROUND

[0002] In rubber industry production, compound extruder is mainly used for extrusion of tire compound tread, automobile sealant strip, rubber tube compound, rubber plastic compound and rubber plate multilayer coextrusion etc. Compound extrusion production process belongs to advanced technology in rubber industry production, it can produce products which can save material and meet various performance requirements through compound extrusion equipment according to different performance requirements of products and different formula and performance of rubber. UTILITY MODEL CONTENTS

[0003] The utility model provides three compound machine head to solve above-mentioned technical problem.

[0004] In order to realize above-mentioned purpose, the technical scheme of the utility model is:

[0005] Three compound machine heads include: upper die body, upper middle die body, middle die body, lower die body, locking structure, upper die body turnover mechanism, upper middle die body turnover mechanism, lower die body turnover mechanism, forming mechanism and plug-in device, the first passageway is formed between the upper die body and the upper middle die body, the second passageway is formed between the upper middle die body and the middle die body, the third passageway is formed between the middle die body and the lower die body, and the forming mechanism includes: first forming runner, second forming runner, third forming runner and converging runner.

[0006] The first forming runner is communicated with the first passageway, the second forming runner is communicated with the second passageway, the third forming runner is communicated with the third passageway, the first forming runner, the second forming runner and the third forming runner converge to the converging runner, and in the vertical direction: the minimum size of the converging runner cross section is greater than the minimum distance of the first forming runner and the third forming runner and less than the maximum distance of the first forming runner and the third forming runner.

[0007] Preferably, the forming mechanism includes: first frame plate, first mouth plate and core type.

[0008] The side of the first frame plate towards the first passageway is provided with the first installation cavity, the core type is detachably installed in the first installation cavity, the upper surface of the core type and the top wall of the first installation cavity form the first forming runner, the lower surface of the core type and the bottom wall of the first installation cavity form the third forming runner, and the center of the core type forms the second forming runner.

[0009] The first frame plate is provided with a second installation cavity on the side away from the first channel, and the first mouth plate is detachably installed in the second installation cavity.

[0010] Preferably, the top wall and the bottom wall of the first installation cavity are inclined surfaces, and the distance between the top wall and the bottom wall of the first installation cavity gradually decreases in the direction away from the first channel; the upper surface of the core mold is matched with the inclined surface of the top wall of the first installation cavity, and the lower surface of the core mold is matched with the inclined surface of the bottom wall of the first installation cavity.

[0011] The upper surface of the core mold is provided with a first groove, the first groove penetrates through the two surfaces of the core mold in the direction from the first installation cavity to the second installation cavity, and forms a first forming flow channel inlet and a first forming flow channel outlet, respectively; the first forming flow channel inlet is connected to the first channel, and the first forming flow channel outlet is connected to the converging flow channel.

[0012] The lower surface of the core mold is provided with a second groove, the second groove penetrates through the two surfaces of the core mold in the direction from the first installation cavity to the second installation cavity, and forms a third forming flow channel inlet and a third forming flow channel outlet, respectively; the third forming flow channel inlet is connected to the third channel, and the third forming flow channel outlet is connected to the converging flow channel.

[0013] Preferably, the two side walls of the first installation cavity are provided with guide grooves, and the guide grooves penetrate to the surface of the first frame plate facing the first channel; the core mold is provided with guide pins on the two sides, and the guide pins slide into the guide grooves for guidance.

[0014] Preferably, in the direction from the first installation cavity to the second installation cavity: the distance between the two side walls of the first groove gradually decreases, and the distance between the two side walls of the second groove gradually decreases.

[0015] Preferably, the core mold comprises a core mold outer frame, a forming block, and a connecting rib; the forming block is arranged in the core mold outer frame, one end of the connecting rib is fixed to the side surface of the forming block, and the other end is fixed to the inner wall of the core mold outer frame.

[0016] Preferably, the inner wall of the second installation cavity facing the first installation cavity is provided with a communication gap in the middle, and the communication gap communicates with the first installation cavity; the first mouth plate abuts against the inner wall of the second installation cavity facing the first installation cavity, and the clamping device presses the surface of the first mouth plate away from the core mold.

[0017] Preferably, the surface of the first mouth plate away from the core mold is provided with a mouth plate through hole.

[0018] The top wall of the mouth plate through hole comprises a first upper plane and a second upper plane connected in sequence, the first upper plane is horizontally arranged and corresponds to the middle part of the first forming flow channel outlet in the vertical direction, and the second upper plane is obliquely arranged and abuts against the inclined surface of the top wall of the first installation cavity.

[0019] The bottom wall of the die plate through hole comprises a first lower plane and a second lower plane connected in sequence, the first lower plane is horizontally arranged and corresponds to the middle part of the third forming flow channel outlet in the vertical direction, and the second upper plane is obliquely arranged and is opposite to the inclined surface of the first installation cavity bottom wall;

[0020] The die plate through hole forms a converging flow channel.

[0021] Preferably, a damping block is also fixed in the second channel.

[0022] Preferably, a middle flow channel plate is embedded on the middle mold body in a detachable manner, the middle flow channel plate is pressed after the upper middle mold body is closed, installation grooves are arranged on the two side inner walls of the middle flow channel plate, the installation grooves pass through to the surface of the middle flow channel plate facing the upper middle mold body, connecting rods are fixed at the two ends of the damping block, the connecting rods are connected with fixing blocks, the fixing blocks are installed in the installation grooves, and the fixing blocks are matched with the installation grooves in shape.

[0023] Beneficial effects:

[0024] The three-compound machine head disclosed in the application is used for the molding of the upper and lower protective layers of the special bulletproof tire body through the first forming flow channel and the third forming flow channel, is used for the molding of the honeycomb support in the middle of the special bulletproof tire body through the second forming flow channel, and is used for the compounding of the upper and lower protective layers and the honeycomb support in the middle after the molding through the converging flow channel, so that one-time molding is realized. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The structure diagram of the three-compound machine head disclosed in the present application;

[0027] Figure 2 The front view of the three-compound machine head disclosed in the present application;

[0028] Figure 3 The Figure 2 The sectional view of A-A;

[0029] Figure 4 The Figure 2 The sectional view of B-B;

[0030] Figure 5 The Figure 3 The local enlarged view of I;

[0031] Figure 6 It is the structural schematic view of the damping block, connecting rod and fixed block combination of the three composite machine head disclosed by the utility model.

[0032] Figure 7 It is the structural schematic view of the three composite machine head forming mechanism disclosed by the utility model.

[0033] Figure 8 It is the front view of the three composite machine head forming mechanism disclosed by the utility model.

[0034] Figure 9 It is the sectional view of A-A. Figure 8 It is the sectional view of B-B.

[0035] Figure 10 It is the sectional view of C-C. Figure 8 It is the sectional view of D-D.

[0036] Figure 11 It is the rear view of the three composite machine head forming mechanism disclosed by the utility model.

[0037] Figure 12 It is the structural schematic view of the three composite machine head core type disclosed by the utility model.

[0038] 11, upper die body; 12, upper middle die body; 13, middle die body; 131, middle runner plate; 14, lower die body; 15, locking structure; 16, upper die body turnover mechanism; 17, upper middle die body turnover mechanism; 18, lower die body turnover mechanism; 21, first frame plate; 2111, guide groove; 22, first mouth plate; 23, core type; 231, core type outer frame; 2311, first recess; 2312, second recess; 232, forming block; 233, connecting rib; 234, guide pin; 24, first forming runner; 25, second forming runner; 26, third forming runner; 27, converging runner; 271, first upper plane; 272, second upper plane; 273, first lower plane; 274, second lower plane; 3, plug-in device; 41, first channel; 42, second channel; 43, third channel; 51, damping block; 52, connecting rod; 53, fixed block; 6, rotating support; 7, limiting block. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0040] Three-compound machine head, combination Figure 1 Figure 12 As shown in the drawings, the three-compound machine head comprises: an upper die body 11, an upper-middle die body 12, a middle die body 13, a lower die body 14, a locking structure 15, an upper die body turnover mechanism 16, an upper-middle die body turnover mechanism 17, a lower die body turnover mechanism 18, a forming mechanism, and a clamping device 3; the upper die body 11 and the upper-middle die body 12 form a first channel 41, the upper-middle die body 12 and the middle die body 13 form a second channel 42, and the middle die body 13 and the lower die body 14 form a third channel 43; the forming mechanism comprises: a first forming runner 24, a second forming runner 25, a third forming runner 26, and a converging runner 27; the first forming runner 24 is connected to the first channel 41, the second forming runner 25 is connected to the second channel 42, the third forming runner 26 is connected to the third channel 43, and the first forming runner 24, the second forming runner 25, and the third forming runner 26 converge into the converging runner 27; in the vertical direction: the minimum size of the cross section of the converging runner 27 is greater than the minimum distance of the first forming runner 24 and the third forming runner 26 and less than the maximum distance of the first forming runner 24 and the third forming runner 26.

[0041] The first forming runner 24 is used for the forming of the upper layer of the special bulletproof tire body, the third forming runner 26 is used for the forming of the lower layer of the special bulletproof tire body, and the second forming runner 25 is used for the forming of the honeycomb support in the middle of the special bulletproof tire body; the converging runner 27 is further provided so that the upper and lower layers of the special bulletproof tire body and the honeycomb support in the middle of the special bulletproof tire body are compounded in the converging runner 27; and in the vertical direction, the minimum size of the cross section of the converging runner 27 is greater than the minimum distance of the first forming runner 24 and the third forming runner 26 and less than the maximum distance of the first forming runner 24 and the third forming runner 26, which avoids excessive extrusion of the honeycomb support in the middle of the special bulletproof tire body when the upper and lower layers of the special bulletproof tire body are compounded and prevents the honeycomb support in the middle of the special bulletproof tire body from being deformed. In summary, the three-compound machine head can be matched with three pin cold feed extruders to realize the one-time forming of the special bulletproof tire body by using three different rubber compounds.

[0042] Preferably, the forming mechanism comprises: a first frame plate 21, a first mouth plate 22, and a core mold 23.

[0043] The first frame plate 21 is provided with a first installation cavity on the side facing the first channel 41, and the core mold 23 is detachably installed in the first installation cavity; the upper surface of the core mold 23 and the top wall of the first installation cavity form the first forming runner 24, the lower surface of the core mold 23 and the bottom wall of the first installation cavity form the third forming runner 26, and the center of the core mold 23 forms the second forming runner 25.

[0044] ​The first frame plate 21 is provided with a second installation cavity on the side away from the first channel 41, and the first mouth plate 22 is detachably installed in the second installation cavity. The first mouth plate 22 abuts against the core mold 23, and the center of the first mouth plate 22 forms the converging flow channel 27. The first mouth plate 22 and the core mold 23 are detachably installed, so that the first mouth plate 22, the core mold 23 and the first frame plate 21 can be conveniently disassembled for cleaning and maintenance.

[0045] Preferably, the top wall and the bottom wall of the first installation cavity are inclined surfaces, and the distance between the top wall and the bottom wall of the first installation cavity gradually decreases in the direction away from the first channel 41. The upper surface of the core mold 23 is matched with the inclined surface of the top wall of the first installation cavity, and the lower surface of the core mold 23 is matched with the inclined surface of the bottom wall of the first installation cavity. After the core mold 23 is pressed on the upper mold body 11, the upper middle mold body 12, the middle mold body 13 and the lower mold body 14, the core mold 23 can be tightly pressed with the first installation cavity, so as to realize reliable positioning and fixing of the core mold 23 and avoid leaving gaps.

[0046] The upper surface of the core mold 23 is provided with a first recess 2311, the first recess 2311 penetrates through the two surfaces of the core mold 23 in the direction from the first installation cavity to the second installation cavity and respectively forms a first forming flow channel inlet and a first forming flow channel outlet. The first forming flow channel inlet is connected to the first channel 41, and the first forming flow channel outlet is connected to the converging flow channel 27. The first recess 2311 and the top wall of the first installation cavity form the first forming flow channel 24, the first forming flow channel inlet is connected to the first channel 41, and the first forming flow channel outlet is connected to the converging flow channel 27, so as to realize that the rubber material enters the first forming flow channel 24 through the first channel 41 for forming and then enters the converging flow channel 27 from the first forming flow channel 24 for compounding.

[0047] The lower surface of the core mold 23 is provided with a second recess 2312, the second recess 2312 penetrates through the two surfaces of the core mold 23 in the direction from the first installation cavity to the second installation cavity and respectively forms a third forming flow channel inlet and a third forming flow channel outlet. The third forming flow channel inlet is connected to the third channel 43, and the third forming flow channel outlet is connected to the converging flow channel 27. The second recess 2312 and the bottom wall of the first installation cavity form the third forming flow channel 26, the third forming flow channel inlet is connected to the third channel 43, and the third forming flow channel outlet is connected to the converging flow channel 27, so as to realize that the rubber material enters the third forming flow channel 26 through the third channel 43 for forming and then enters the converging flow channel 27 from the third forming flow channel 26 for compounding.

[0048] Preferably, a guide groove 2111 is formed on each of the two side walls of the first installation cavity, and the guide groove 2111 penetrates to the surface of the first frame plate 21 facing the first channel 41; the two sides of the core mold 23 are fixedly provided with a guide pin 234, and the guide pin 234 slides into the guide groove 2111 for guidance. When the core mold 23 is installed, the guide pin 234 is first aligned with the guide groove 2111, and the guide pin 234 is guided by the guide groove 2111 to guide the installation of the core mold 23 to the first installation cavity.

[0049] Specifically, the guide groove 2111 gradually inclines downward along the installation direction of the guide pin 234, so that when the core mold 23 is installed, the upper surface of the core mold 23 first slides in contact with the top wall of the first installation cavity, and after sliding to a certain position, the lower surface of the core mold 23 is in contact with the bottom wall of the first installation cavity.

[0050] Preferably, in the direction from the first installation cavity to the second installation cavity: the distance between the two side walls of the first groove 2311 gradually decreases, and the distance between the two side walls of the second groove 2312 gradually decreases, so that the rubber is extruded into a shape.

[0051] Preferably, the core mold 23 comprises a core mold outer frame 231, a forming block 232, and a connecting rib 233; the forming block 232 is arranged in the core mold outer frame 231, and one end of the connecting rib 233 is fixedly arranged on the side surface of the forming block 232, and the other end is fixedly arranged on the inner wall of the core mold outer frame 231. The forming block 232 and the connecting rib 233 in the core mold outer frame 231 block the rubber to flow from the second forming runner 25 formed by the void, thereby achieving the forming of the honeycomb support in the middle of the special bulletproof tire body. In this embodiment, the forming block 232 is five, one of the five forming blocks 232 is in the middle, and the other four are arranged around it. The forming block 232 in the middle is connected to the other four forming blocks 232 through four connecting ribs 233, respectively, and the four forming blocks 232 are connected to the inner wall of the core mold outer frame 231 through two connecting ribs 233, respectively. The forming block 232 is a combination of a hexagonal prism and a hexagonal pyramid, and the hexagonal pyramid faces the second channel 42.

[0052] Preferably, a communication gap is formed in the middle of the inner wall of the second installation cavity facing the first installation cavity, and the communication gap communicates with the first installation cavity; the first mouth plate 22 abuts against the inner wall of the second installation cavity facing the first installation cavity, and the insertion device 3 compresses the surface of the first mouth plate 22 away from the core mold 23, thereby achieving the installation and compression of the first mouth plate 22, and further compressing the first frame plate 21 and the core mold 23 through the first mouth plate 22.

[0053] Preferably, a mouth plate through hole is formed in the surface of the first mouth plate 22 away from the core mold 23;

[0054] The top wall of the die plate through hole includes a first upper plane 271 and a second upper plane 272 connected in sequence. The first upper plane 271 is horizontally arranged and corresponds to the middle of the first molding flow channel outlet in the vertical direction. The second upper plane 272 is inclined and connected to the inclined surface of the top wall of the first installation cavity.

[0055] The bottom wall of the die plate through hole includes a first lower plane 273 and a second lower plane 274 connected in sequence. The first lower plane 273 is horizontally arranged and corresponds to the middle of the outlet of the third molding flow channel in the vertical direction. The second upper plane 272 is inclined and connected to the inclined surface of the bottom wall of the first installation cavity.

[0056] The through hole of the die plate forms the converging flow channel 27. The second upper plane 272 and the second lower plane 274 realize the transition from the inclined first molding flow channel 24 and the third molding flow channel 26 to the converging flow channel 27. The cooperation of the first upper plane 271 and the first lower plane 273 can ensure that the minimum dimension of the cross section of the converging flow channel 27 in the vertical direction is greater than the minimum distance between the first molding flow channel 24 and the third molding flow channel 26, and less than the maximum distance between the first molding flow channel 24 and the third molding flow channel 26.

[0057] Specifically, the first frame plate 21 is connected to the middle mold body 13 via the rotating support 6 , so as to facilitate the rotation and removal of the molding mechanism to expose the outlets of the first channel 41 , the second channel 42 and the third channel 43 .

[0058] Specifically, the middle mold body 13 is provided with two sizes of molding mechanisms for processing special bulletproof tire carcasses of different sizes.

[0059] Preferably, a damping block 51 is further fixedly provided in the second channel 42 , and the damping block 51 is used to make the rubber material flow evenly through the second molding flow channel 25 .

[0060] Specifically, the damping block 51 includes a small cone away from the core 23, a quadrangular prism and a large cone in sequence. The large end of the quadrangular prism is connected to the large cone, and the height of the large cone is smaller than that of the small cone.

[0061] Preferably, a detachably connected middle flow channel plate 131 is inlaid on the middle mold body 13, and the middle flow channel plate 131 is pressed tightly when the upper middle mold body 12 is closed. Installation grooves are provided on the inner walls on both sides of the middle flow channel plate 131, and the installation grooves pass through to the surface of the middle flow channel plate 131 facing the upper middle mold body 12. Connecting rods 52 are fixed at both ends of the damping block 51, and the connecting rods 52 are connected to the fixing block 53. The fixing block 53 is installed in the installation groove, and the shape of the fixing block 53 matches the installation groove. When the upper middle mold body 12 is closed, the fixing block 53 is pressed tightly, thereby fixing the damping block 51.

[0062] Specifically, the limiting block 7 is fixed on the middle die body 13 by screws, the bottom of the middle runner plate 131 is provided with a corresponding limiting groove, the limiting block 7 is clamped into the limiting groove, and then the upper middle die body 12 is closed to press the middle runner plate 131, so that the detachable connection of the middle runner plate 131 is realized, thereby facilitating the disassembly of the middle runner plate 131 for cleaning and maintenance.

[0063] Specifically, the structures of the upper die body 11, the upper middle die body 12, the middle die body 13, the lower die body 14 and the plug-in device 3 are prior art, such as the composite extruder head of patent CN209381347U, the upper die body 11 corresponds to the upper die therein, the upper middle die body 12 corresponds to the middle die therein, the middle die body 13 corresponds to the machine body therein, and the lower die body 14 corresponds to the lower die therein, which will not be described here.

[0064] The structures of the locking structure 15, the upper die body turnover mechanism 16, the upper middle die body turnover mechanism 17, the lower die body turnover mechanism 18 and the plug-in device 3 are prior art, such as the hydraulic composite head of the composite multi-rubber material extruder of patent CN201012535Y, the locking structure 15 corresponds to the left and right door locking mechanism therein, the upper die body turnover mechanism 16 corresponds to the upper turnover mechanism therein, the upper middle die body turnover mechanism 17 corresponds to the upper middle turnover mechanism therein, the lower die body turnover mechanism 18 corresponds to the lower turnover mechanism therein, and the plug-in device 3 corresponds to the upper plug-in device and the lower plug-in device therein, which will not be described here.

[0065] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Triple composite handpiece, including: An upper mold body (11), an upper middle mold body (12), a middle mold body (13), a lower mold body (14), a locking structure (15), an upper mold body flipping mechanism (16), an upper middle mold body flipping mechanism (17), a lower mold body flipping mechanism (18), a molding mechanism and a tightening device (3); a first channel (41) is formed between the upper mold body (11) and the upper middle mold body (12), a second channel (42) is formed between the upper middle mold body (12) and the middle mold body (13), and a third channel (43) is formed between the middle mold body (13) and the lower mold body (14); characterized in that the molding mechanism includes: a first molding flow channel (24), a second molding flow channel (25), a third molding flow channel (26) and a converging flow channel (27); The first molding flow channel (24) is connected to the first channel (41), the second molding flow channel (25) is connected to the second channel (42), and the third molding flow channel (26) is connected to the third channel (43). The first molding flow channel (24), the second molding flow channel (25), and the third molding flow channel (26) merge into the merged flow channel (27); in the vertical direction, the minimum size of the cross section of the merged flow channel (27) is greater than the minimum distance between the first molding flow channel (24) and the third molding flow channel (26), and is smaller than the maximum distance between the first molding flow channel (24) and the third molding flow channel (26).

2. The triple-combination handpiece according to claim 1, characterized in that: The molding mechanism comprises: a first frame plate (21), a first die plate (22) and a core mold (23); A first mounting cavity is provided on one side of the first frame plate (21) facing the first channel (41), and the core mold (23) is detachably mounted in the first mounting cavity. The upper surface of the core mold (23) and the top wall of the first mounting cavity form the first molding flow channel (24), the lower surface of the core mold (23) and the bottom wall of the first mounting cavity form the third molding flow channel (26), and the center of the core mold (23) forms the second molding flow channel (25); A second mounting cavity is provided on a side of the first frame plate (21) away from the first channel (41), and the first die plate (22) is detachably mounted in the second mounting cavity. The first die plate (22) abuts against the core mold (23), and the center of the first die plate (22) forms the converging flow channel (27).

3. The triple-combination handpiece according to claim 2, characterized in that: The top wall and bottom wall of the first installation cavity are inclined surfaces, and the distance between the top wall and the bottom wall of the first installation cavity gradually decreases in a direction away from the first channel (41); the upper surface of the core mold (23) cooperates with the inclined surface of the top wall of the first installation cavity, and the lower surface of the core mold (23) cooperates with the inclined surface of the bottom wall of the first installation cavity; A first groove (2311) is formed on the upper surface of the core mold (23), and the first groove (2311) passes through the two surfaces of the core mold (23) in the direction from the first installation cavity to the second installation cavity and respectively forms a first molding flow channel inlet and a first molding flow channel outlet, the first molding flow channel inlet is connected to the first channel (41), and the first molding flow channel outlet is connected to the converging flow channel (27); A second groove (2312) is provided on the lower surface of the core mold (23), and the second groove (2312) passes through the two surfaces of the core mold (23) in the direction from the first installation cavity to the second installation cavity to form a third molding flow channel inlet and a third molding flow channel outlet, respectively. The third molding flow channel inlet is connected to the third channel (43), and the third molding flow channel outlet is connected to the converging flow channel (27).

4. The triple-combination handpiece according to claim 3, characterized in that: Guide grooves (2111) are provided on both side walls of the first installation cavity, and the guide grooves (2111) extend through the surface of the first frame plate (21) facing the first channel (41); guide pins (234) are fixed on both sides of the core mold (23), and the guide pins (234) slide into the guide grooves (2111) for guidance.

5. The triple-combination handpiece according to claim 3, characterized in that: In the direction from the first installation cavity to the second installation cavity: the distance between the two side walls of the first groove (2311) gradually decreases, and the distance between the two side walls of the second groove (2312) gradually decreases.

6. The triple-combination handpiece according to claim 3, characterized in that: The core mold (23) comprises a core mold outer frame (231), a molding block (232) and a connecting rib (233); the molding block (232) is arranged in the core mold outer frame (231), and one end of the connecting rib (233) is fixed to the side of the molding block (232), and the other end is fixed to the inner wall of the core mold outer frame (231).

7. The triple-combination handpiece according to claim 3, characterized in that: A connecting notch is provided in the middle of the inner wall of the second installation cavity toward the first installation cavity, and the connecting notch is connected to the first installation cavity; the first die plate (22) abuts against the inner wall of the second installation cavity toward the first installation cavity, and the tightening device (3) presses the first die plate (22) away from the surface of the core mold (23).

8. The triple-combination handpiece according to claim 7, characterized in that: A die plate through hole is provided on the surface of the first die plate (22) away from the core mold (23); The top wall of the die plate through hole comprises a first upper plane (271) and a second upper plane (272) connected in sequence, the first upper plane (271) being arranged horizontally and corresponding to the middle of the first molding flow channel outlet in the vertical direction, and the second upper plane (272) being arranged obliquely and corresponding to the inclined surface of the top wall of the first installation cavity; The bottom wall of the die plate through hole comprises a first lower plane (273) and a second lower plane (274) connected in sequence, the first lower plane (273) being arranged horizontally and corresponding to the middle of the outlet of the third molding flow channel in the vertical direction, and the second upper plane (272) being arranged obliquely and corresponding to the inclined surface of the bottom wall of the first installation cavity; The through hole of the die plate forms the converging flow channel (27).

9. The triple-combination handpiece according to claim 1, characterized in that: A damping block (51) is also fixedly provided in the second channel (42).

10. The triple-combination handpiece according to claim 9, characterized in that: The middle mold body (13) is inlaid with a detachably connected middle flow plate (131), and the middle flow plate (131) is pressed tightly when the upper middle mold body (12) is closed. The inner walls on both sides of the middle flow plate (131) are provided with mounting grooves, and the mounting grooves pass through to the surface of the middle flow plate (131) facing the upper middle mold body (12). Connecting rods (52) are fixed at both ends of the damping block (51), and the connecting rods (52) are connected to the fixing block (53). The fixing block (53) is installed in the mounting groove, and the shape of the fixing block (53) matches the mounting groove. When the upper middle mold body (12) is closed, the fixing block (53) is pressed tightly.

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