An anti-loosening and leak-proof injection head with an elastic locking mechanism and an injection molding machine

Abstract

The present invention relates to the technical field of injection heads, and specifically relates to an anti-loosening and leak-proof injection head with an elastic locking mechanism and an injection molding machine, including an injection head body, a locking and leak-proof device, a mounting seat and a connecting pipe; an annular groove is formed on the side wall of the injection head body around the axis of the injection head body; an elastic sleeve is fixedly arranged on the annular groove along the axis of the injection head body, and the elastic sleeve and the annular groove form an accommodating cavity; a supporting device is arranged on the injection head body; an injection pipeline is axially penetrated through the injection head body, and an extrusion device is arranged on the inner wall of the injection pipeline; a channel is arranged in the injection head body, and both ends of the channel are communicated with the extrusion device and the accommodating cavity respectively; a clamping device is arranged on the outer wall of the injection head body, and the clamping device can be clamped and matched with the inner wall of the jack; a connecting device is arranged at the tail of the injection head body. The present invention ensures the sealing performance of the gap between the injection head body and the jack.

Description

Technical Field

[0001] The present invention relates to the technical field of injection heads, and specifically relates to an anti-loosening and anti-leakage injection head with an elastic locking mechanism and an injection molding machine. Background Art

[0002] Injection molding is a method for manufacturing industrial product shapes; products are usually made by rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding, compression molding and die-casting methods; an injection molding machine is the main molding equipment for making various shaped plastic products from thermoplastic or thermosetting materials; an injection head is installed on the injection molding machine. However, for the injection heads used in current traditional injection molding machines, the injection heads are prone to loosening, and after the injection heads are loosened, it is easy to cause liquid leakage during the injection molding process; secondly, when the injection heads are subjected to excessive force during use, it is easy to cause breakage and liquid leakage.

[0003] Chinese Patent Application CN115489078A discloses an anti-leakage injection head for an injection molding machine, which specifically includes: an injection head body, a locking part and an auxiliary part; the injection head body is inserted into the injection molding equipment, and a connector is threadedly connected to the tail end of the injection head body; an auxiliary groove is opened at the bottom of the injection head body, and the auxiliary groove is a conical groove structure; the locking part is composed of a ratchet wheel, a rotating shaft, a locking piece, a coil spring and an elastic member, and the ratchet wheel is welded to the connector; the auxiliary part is composed of an auxiliary seat, a jack, a mounting seat and a plug rod, and the auxiliary seat is welded to the injection molding equipment; the mounting seat is welded to the outer wall of the injection head body.

[0004] Although the above solution can prevent the leakage of the injection head itself, it cannot guarantee that when the injection head is inserted into the injection cavity, leakage will occur in the gap between the injection head and the jack on the injection cavity, and when connecting the connector and the injection head body, the connection force between the connector and the injection head body overly relies on the installation experience of workers. If it is installed too tightly, it is not convenient for disassembly and replacement, and if it is installed too loosely, it is easy to cause leakage. Summary of the Invention

[0005] To solve the above problems, a leak-proof injection head with an elastic locking mechanism and an injection molding machine are provided. The injection head body is inserted into the jack of the mounting seat, and the clamping device provided on the injection head body will be clamped with the mounting seat to ensure that the injection head body will not slip out of the jack during injection. When the injection head body is injecting, molten material will pass through the injection pipe provided in the injection head body. The molten material will push the extrusion device, so that the extrusion device will discharge the air inside it into the accommodation groove formed by the elastic sleeve and the annular groove through the through groove. As the extrusion device is continuously extruded, the air in the extrusion device will also continuously enter the accommodation groove, so that the elastic sleeve expands. The expanded elastic sleeve fills the annular cavity, thus realizing self-sealing. This is because when molten material flows out from the gap between the plug and the injection head body, the pressure in the injection cavity is very high at this time. Similarly, the pressure in the injection pipe of the injection head body is also very high, so as to ensure that the molten material can be injected into the injection cavity. At this time, the extrusion device will be further extruded, so that the elastic sleeve expands more severely. At this time, the internal and external pressures of the elastic sleeve are basically the same, so that the molten material in the injection cavity will not flow out from the gap between the injection head body and the jack, ensuring the tightness of the gap between the injection head body and the jack.

[0006] To solve the problems of the prior art, the present invention provides a leak-proof injection head with an elastic locking mechanism, including an injection head body, a locking and leak-proof device, a mounting seat and a connecting pipe; the locking and leak-proof device includes an elastic sleeve, a support device, an annular groove, a channel, an extrusion device, a clamping device and a connecting device; the annular groove is opened on the side wall of the injection head body around the axis of the injection head body; a jack is horizontally penetrated through the mounting seat, the injection head body is inserted and matched with the jack, an annular cavity is opened on the inner wall of the jack around the axis of the jack, the elastic sleeve is fixedly arranged on the annular groove along the axis of the injection head body, and the elastic sleeve and the annular groove form an accommodation cavity; the support device is arranged on the injection head body, and the support device supports the inner wall of the elastic sleeve; the injection head body is penetrated through along its own axis to form an injection pipe, and the extrusion device is arranged on the inner wall of the injection pipe; the channel is arranged in the injection head body, and both ends of the channel are communicated with the extrusion device and the accommodation cavity respectively, and the extrusion device can discharge air into the accommodation cavity after being extruded; the clamping device is arranged on the outer wall of the injection head body, and the clamping device can be clamped and matched with the inner wall of the jack; the connecting device is arranged at the tail of the injection head body, and the connecting device is used to connect the connecting pipe and the injection head body.

[0007] Preferably, the extrusion device includes an extrusion groove, an extrusion plate and a first spring; the extrusion groove is opened on the side wall of the injection pipe along the radial direction of the injection head body; the extrusion plate is slidably arranged in the extrusion groove along the extension direction of the extrusion groove, there is a first gap between the extrusion plate and the bottom of the extrusion groove, and the extrusion groove is communicated with the channel; the first spring is arranged in the first gap.

[0008] Preferably, the clamping device includes a clamping block, a second spring, a groove and a clamping slot; the groove is formed in the side wall of the injection head body along the radial direction of the injection head body, and an electromagnet is arranged at the bottom of the groove; the clamping block is slidably arranged in the groove along the extending direction of the groove, and there is a second gap between the clamping block and the bottom of the groove; the second spring is arranged in the second gap; the clamping slot is formed in the inner wall of the jack, and the clamping block and the clamping slot are in clamping fit.

[0009] Preferably, the supporting device includes a support rod, a support plate and a sliding groove; the sliding groove is formed in the injection head body along the radial direction of the injection head body, and the sliding groove is located in the accommodating groove; the support rod is slidably arranged in the sliding groove along the length direction of the sliding groove; the support plate is fixedly arranged at one end of the support rod away from the injection head body, and the support plate is fixedly connected with the inner wall of the elastic sleeve.

[0010] Preferably, the locking and leak-proof device further includes a protective member; there are a plurality of protective members, and the protective members are arranged around the axis of the injection head body on one side of the elastic sleeve close to the output end of the injection head body, and the protective members have a heat insulation function.

[0011] Preferably, the connecting device includes a connecting member, a limiting component, a self-locking device and a nut; the connecting member is of a cylindrical structure, the connecting member is arranged at the tail of the injection head body, and the connecting member is in threaded fit with the injection head body; the limiting component is arranged on the side of the connecting member away from the injection head body; the self-locking device is respectively arranged on the connecting member and the injection head body, and the self-locking device can lock the connecting member; the nut is fixedly connected with one end of the connecting member away from the injection head body along the axis of the connecting member, and one end of the nut away from the connecting member is connected with the connecting pipe.

[0012] Preferably, the self-locking device includes a self-locking block, a convex block, a self-locking slot, a third spring and a pushing block; the self-locking slot is formed in the tail of the injection head body along the axis of the injection head body; the self-locking block is slidably arranged in the self-locking slot along the length direction of the self-locking slot, and there is a third gap between the self-locking block and the bottom of the self-locking slot; the third spring is arranged in the third gap; the convex block is fixedly arranged on the side wall of the connecting member, and the convex block can be restricted by the self-locking block; the pushing block is arranged on the upper part of the self-locking block, and the pushing block can drive the self-locking block to slide along the length direction of the self-locking slot.

[0013] Preferably, the limiting component includes a limiting frame, a limiting rod and an extension ear; the limiting frame is arranged on the side of the connecting member away from the injection head body; the limiting rod is fixedly arranged on the limiting frame along the axis of the injection head body; the extension ear is fixedly arranged on the side wall of the injection head body, and the limiting rod can penetrate through the extension ear and be in sliding fit with the extension ear.

[0014] Preferably, an exhaust hole is vertically formed through the mounting seat, the exhaust hole is communicated with the annular cavity, and a switching valve is arranged at the upper part of the exhaust hole.

[0015] The present invention also relates to an injection molding machine, including an anti-loosening and liquid-leakage injection head with an elastic locking mechanism.

[0016] The beneficial effects of the present invention compared with the prior art are as follows: By setting an elastic sleeve, a support device, an annular groove, a channel, an extrusion device, a clamping device and a connecting device, when the injection head body is inserted into the jack of the mounting seat, the clamping device provided on the injection head body will be clamped with the mounting seat, ensuring that the injection head body will not slip out of the jack during injection. When the injection head body is injecting, molten material will pass through the injection pipe in the injection head body, and the molten material will push the extrusion device, so that the extrusion device discharges the air inside it into the accommodation groove formed by the elastic sleeve and the annular groove through the through groove. As the extrusion device is continuously squeezed, the air in the extrusion device will also continuously enter the accommodation groove, thus causing the elastic sleeve to expand. The expanded elastic sleeve fills the annular cavity, thus realizing self-sealing. This is because when molten material flows out from the gap between the plug and the injection head body, the pressure in the injection cavity is very high. Similarly, the pressure in the injection pipe of the injection head body is also very high, so as to ensure that the molten material can be injected into the injection cavity. At this time, the extrusion device will be further squeezed, so that the elastic sleeve expands more severely. At this time, the internal and external pressures of the elastic sleeve are basically the same, so that the molten material in the injection cavity will not flow out from the gap between the injection head body and the jack, ensuring the tightness of the gap between the injection head body and the jack. Description of the Drawings

[0017] Figure 1 is a three-dimensional schematic diagram after an anti-loosening and liquid-leakage injection head with an elastic locking mechanism is inserted into the mounting seat;

[0018] Figure 2 is a three-dimensional schematic diagram of an anti-loosening and liquid-leakage injection head with an elastic locking mechanism;

[0019] Figure 3 is an anti-loosening and liquid-leakage injection head with an elastic locking mechanism Figure 2 partial enlarged schematic diagram of part A therein;

[0020] Figure 4 is an anti-loosening and liquid-leakage injection head with an elastic locking mechanism Figure 2 partial enlarged schematic diagram of part B therein;

[0021] Figure 5 is a three-dimensional schematic diagram of an anti-loosening and liquid-leakage injection head with an elastic locking mechanism after removing the connecting pipe and part of the connecting device;

[0022] Figure 6 is a side view of an anti-loosening and liquid-leakage injection head with an elastic locking mechanism;

[0023] Figure 7 A cross-sectional schematic view taken along line C-C of an anti-loosening and anti-leakage injection head with an elastic locking mechanism Figure 6 in;

[0024] Figure 8 A cross-sectional schematic view taken along line C-C of an anti-loosening and anti-leakage injection head with an elastic locking mechanism Figure 7 A partially enlarged schematic view at position D in;

[0025] Figure 9 A cross-sectional schematic view taken along line C-C of an anti-loosening and anti-leakage injection head with an elastic locking mechanism Figure 7 A partially enlarged schematic view at position E in;

[0026] Figure 10 A three-dimensional schematic view of an anti-loosening and anti-leakage injection head with an elastic locking mechanism after removing the elastic sleeve, connecting pipe, and part of the connecting device

[0027] In the figure, the reference numerals are: 1 - injection head body; 2 - locking and anti-leakage device; 21 - elastic sleeve; 211 - support device; 2111 - support rod; 2112 - support plate; 2113 - chute; 212 - protective member; 22 - annular groove; 23 - channel; 24 - extrusion device; 241 - extrusion groove; 242 - extrusion plate; 243 - first spring; 25 - clamping device; 251 - clamping block; 252 - second spring; 253 - groove; 26 - connecting device; 261 - connecting member; 262 - limiting component; 2621 - limiting frame; 2622 - limiting rod; 2623 - extension ear; 263 - self-locking device; 2631 - self-locking block; 2632 - convex block; 2633 - self-locking groove; 2634 - third spring; 2635 - pushing block; 264 - nut; 3 - mounting seat; 31 - jack; 32 - exhaust hole; 33 - switch valve; 4 - connecting pipe Detailed implementation manners

[0028] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners

[0029] Refer to Figure 1 、 Figure 2 、 Figure 7 、 Figure 8 and Figure 10:An anti-loosening and leak-proof injection head with an elastic locking mechanism, comprising an injection head body 1, a locking and leak-proof device 2, a mounting seat 3 and a connecting pipe 4; the locking and leak-proof device 2 includes an elastic sleeve 21, a supporting device 211, a ring groove 22, a channel 23, a pressing device 24, a clamping device 25 and a connecting device 26; the ring groove 22 is provided on the side wall of the injection head body 1 around the axis of the injection head body 1; a jack 31 is horizontally penetrated and provided on the mounting seat 3, the injection head body 1 is in plug-in fit with the jack 31, an annular cavity is provided on the inner wall of the jack 31 around the axis of the jack 31, the elastic sleeve 21 is fixedly arranged on the ring groove 22 along the axis of the injection head body 1, and the elastic sleeve 21 and the ring groove 22 form a receiving cavity; the supporting device 211 is arranged on the injection head body 1, and the supporting device 211 supports the inner wall of the elastic sleeve 21; an injection pipe is penetrated through the injection head body 1 along its own axis, and the pressing device 24 is arranged on the inner wall of the injection pipe; the channel 23 is arranged in the injection head body 1, and the two ends of the channel 23 are respectively communicated with the pressing device 24 and the receiving cavity, and after being pressed, the pressing device 24 can discharge air into the receiving cavity; the clamping device 25 is arranged on the outer wall of the injection head body 1, and the clamping device 25 can be in clamping fit with the inner wall of the jack 31; the connecting device 26 is arranged at the tail of the injection head body 1, and the connecting device 26 is used for communicating the connecting pipe 4 and the injection head body 1.

[0030] On one side of the mounting base 3, there is an injection molding cavity, which is the place where molten material is injection molded. That is, the injection head body 1 needs to inject the molten material into the injection molding cavity first. During use, the injection head body 1 is inserted into the jack 31 of the mounting base 3, and the clamping device 25 provided on the injection head body 1 will be clamped with the mounting base 3 to ensure that the injection head body 1 will not slip out of the jack 31 during injection. When the injection head body 1 is injecting, the injection pipe provided in the injection head body 1 will have molten material passing through. The molten material will push the extrusion device 24, so that the extrusion device 24 discharges the air inside it through the through groove into the accommodation groove formed by the elastic sleeve 21 and the annular groove 22. As the extrusion device 24 is continuously extruded, the air in the extrusion device 24 will also continuously enter the accommodation groove, so that the elastic sleeve 21 expands. The expanded elastic sleeve 21 fills the annular cavity, thus realizing self-sealing. This is because when molten material flows out from the gap between the plug and the injection head body 1, the pressure in the injection molding cavity is very high at this time. Similarly, the pressure in the injection pipe of the injection head body 1 is also very high, so as to ensure that the molten material can be injected into the injection molding cavity. At this time, the extrusion device 24 will be further extruded, so that the elastic sleeve 21 expands more severely. At this time, the internal and external pressures of the elastic sleeve 21 are basically the same, so that the molten material located in the injection molding cavity will not flow out from the gap between the injection head body 1 and the jack 31, ensuring the sealing performance of the gap between the injection head body 1 and the jack 31. The connecting device 26 provided at the tail of the injection head body 1 is used to connect with the connecting pipe 4. The connecting device 26 can ensure that there is no liquid leakage when the injection head body 1 and the connecting pipe 4 are connected. The molten material enters the injection head body 1 through the connecting pipe 4 and finally is discharged into the injection molding cavity for injection molding.

[0031] Refer to Figure 7 and Figure 8 : The extrusion device 24 includes an extrusion groove 241, an extrusion plate 242 and a first spring 243; the extrusion groove 241 is opened on the side wall of the injection pipe along the radial direction of the injection head body 1; the extrusion plate 242 is slidably arranged in the extrusion groove 241 along the extension direction of the extrusion groove 241. There is a first gap between the extrusion plate 242 and the bottom of the extrusion groove 241, and the extrusion groove 241 communicates with the channel 23; the first spring 243 is arranged in the first gap.

[0032] When the molten material passes through the injection pipe, the pressure in the injection pipe increases, and the extrusion plate 242 is pushed to slide, so that the first spring 243 will be compressed. The air in the extrusion groove 241 is extruded by the extrusion plate 242 and enters the accommodation cavity formed by the elastic sleeve 21 and the annular groove 22 through the channel 23, thereby making the elastic sleeve 21 gradually expand.

[0033] Refer to Figure 7 and Figure 8: The clamping device 25 includes a clamping block 251, a second spring 252, a groove 253 and a clamping groove; the groove 253 is opened on the side wall of the injection head body 1 along the radial direction of the injection head body 1, and an electromagnet is arranged at the bottom of the groove 253; the clamping block 251 is slidably arranged in the groove 253 along the extending direction of the groove 253, and there is a second gap between the clamping block 251 and the bottom of the groove 253; the second spring 252 is arranged in the second gap; the clamping groove is opened on the inner wall of the jack 31, and the clamping block 251 and the clamping groove are in clamping fit.

[0034] After the injection head body 1 is inserted into the jack 31, the clamping block 251 arranged on the injection head body 1 will be clamped with the clamping groove. When the injection head body 1 injects the molten material into the injection cavity, the air in the injection cavity will generate a reaction force on the injection head body 1. The clamping of the clamping block 251 and the clamping groove can prevent the injection head body 1 from sliding along its own axis, so as to ensure that the expanded elastic sleeve 21 will not be damaged and ensure that the elastic sleeve 21 can achieve normal sealing.

[0035] Refer to Figure 7 、 Figure 9 and Figure 10 : The supporting device 211 includes a supporting rod 2111, a supporting plate 2112 and a sliding groove 2113; the sliding groove 2113 is opened on the injection head body 1 along the radial direction of the injection head body 1, and the sliding groove 2113 is located in the receiving groove; the supporting rod 2111 is slidably arranged in the sliding groove 2113 along the length direction of the sliding groove 2113; the supporting plate 2112 is fixedly arranged at one end of the supporting rod 2111 away from the injection head body 1, and the supporting plate 2112 is fixedly connected with the inner wall of the elastic sleeve 21.

[0036] When the elastic sleeve 21 expands, the elastic sleeve 21 will drive the supporting rod 2111 to slide out of the sliding groove 2113. The expansion of the elastic sleeve 21 will receive a thrust along the axial direction of the injection head body 1. Although there is the clamping device 25 for support, it is inevitable that the molten material flows out from the gap between the jack 31 and the injection head body 1 and acts on the elastic sleeve 21. After the supporting rod 2111 is arranged, it can ensure that the elastic sleeve 21 is not easily deformed along the axial direction of the injection head body 1, and then ensure the resistance of the elastic sleeve 21 to the outflow of the molten material. Otherwise, if the supporting rod 2111 is not arranged, due to the elastic characteristics of the elastic sleeve 21, there will still be a situation where part of the molten material pushes the elastic sleeve 21 along the axial direction of the injection head body 1, resulting in part of the molten material infiltrating into the annular cavity.

[0037] Refer to Figure 5 : The locking and leak-proof device 2 further includes a protective member 212; there are multiple protective members 212, and the protective members 212 are arranged around the axis of the injection head body 1 on the side of the elastic sleeve 21 close to the output end of the injection head body 1, and the protective members 212 have a heat insulation function.

[0038] By providing the protective member 212, it is ensured that the high temperature of the molten material does not act on the elastic sleeve 21 through the gap between the jack 31 and the injection head body 1, preventing the elastic sleeve 21 from being damaged after being exposed to high temperature, and thus reducing the sealing performance of the elastic sleeve 21.

[0039] Refer to Figure 1 、 Figure 5 and Figure 7 : The connecting device 26 includes a connecting member 261, a limiting component 262, a self-locking device 263, and a nut 264; the connecting member 261 has a cylindrical structure, the connecting member 261 is arranged at the tail of the injection head body 1, and the connecting member 261 is in threaded cooperation with the injection head body 1; the limiting component 262 is arranged on the side of the connecting member 261 away from the injection head body 1; the self-locking device 263 is respectively arranged on the connecting member 261 and the injection head body 1, and the self-locking device 263 can lock the connecting member 261; the nut 264 is fixedly connected to one end of the connecting member 261 away from the injection head body 1 along the axis of the connecting member 261, and the end of the nut 264 away from the connecting member 261 is connected to the connecting pipe 4.

[0040] During installation, the limiting component 262 is arranged at the tail of the injection head body 1, and the limiting component 262 can provide support for the connecting member 261. Subsequently, the connecting member 261 is rotated so that the connecting member 261 is connected to the injection head body 1. In order to ensure that there is no liquid leakage between the injection head body 1 and the connecting pipe 4 after installation, it is necessary to ensure that the connecting member 261 is tightened enough with the injection head body 1. Thus, after manually screwing the connecting member 261 into the injection head body 1, it is necessary to rotate the nut 264 with a wrench, and the connecting member 261 is driven to rotate by the nut 264. When the connecting member 261 is fully in threaded cooperation with the injection head body 1, the self-locking device 263 will lock the connecting member 261 to prevent the connecting member 261 from rotating self.

[0041] Refer to Figure 4 and Figure 5 : The self-locking device 263 includes a self-locking block 2631, a convex block 2632, a self-locking groove 2633, a third spring 2634, and a pushing block 2635; the self-locking groove 2633 is opened along the axis of the injection head body 1 at the tail of the injection head body 1; the self-locking block 2631 is slidably arranged in the self-locking groove 2633 along the length direction of the self-locking groove 2633, and there is a third gap between the self-locking block 2631 and the bottom of the self-locking groove 2633; the third spring 2634 is arranged in the third gap; the convex block 2632 is fixedly arranged on the side wall of the connecting member 261, and the convex block 2632 can be restricted by the self-locking block 2631; the pushing block 2635 is arranged on the upper part of the self-locking block 2631, and the pushing block 2635 can drive the self-locking block 2631 to slide along the length direction of the self-locking groove 2633.

[0042] When the connecting member 261 rotates, the bump 2632 provided on the connecting member 261 also rotates synchronously. When the self-locking block 2631 is pressed down as the connecting member 261 continuously rotates, it indicates that the connecting member 261 is about to be fully thread-fitted with the injection head body 1. When the connecting member 261 can no longer be rotated by the nut 264, at this time, the bump 2632 contacts the tail of the injection head body 1, thus hindering the rotation of the connecting member 261. At the same time, the self-locking block 2631 also restricts the bump 2632, making the connecting member 261 unable to rotate in the reverse direction, thereby avoiding the loosening of the connecting member 261. When it is necessary to replace the injection head body 1, only need to push the push block 2635, so that the push block 2635 drives the self-locking block 2631 to slide in the self-locking groove 2633. At this time, the third spring 2634 is compressed, and the self-locking block 2631 no longer restricts the bump 2632, and the connecting member 261 can also be taken out from the injection head body 1.

[0043] Refer to Figure 2 and Figure 3 : The limiting component 262 includes a limiting frame 2621, a limiting rod 2622 and an extension ear 2623; the limiting frame 2621 is arranged on the side of the connecting member 261 away from the injection head body 1; the limiting rod 2622 is fixedly arranged on the limiting frame 2621 along the axis of the injection head body 1; the extension ear 2623 is fixedly arranged on the side wall of the injection head body 1, and the limiting rod 2622 can penetrate through the extension ear 2623 and is slidably matched with the extension ear 2623.

[0044] Before installing the connecting member 261 on the injection head body 1, it is necessary to make the limiting rod 2622 penetrate into the extension ear 2623, and then screw the connecting member 261 into the injection head body 1. However, the manual screwing force is limited. At this time, a wrench is needed to screw the nut 264. The limiting rod 2622 and the limiting frame 2621 provide support for the rotation of the nut 264 and the connecting member 261, ensuring that the nut 264 can stably drive the connecting member 261 to rotate.

[0045] Refer to Figure 7 : An exhaust hole 32 is vertically penetrated through the mounting base 3, and the exhaust hole 32 communicates with the annular cavity. A switching valve 33 is arranged at the upper part of the exhaust hole 32.

[0046] When the injection head body 1 starts to inject the molten material into the injection cavity, the extrusion device 24 is extruded. The extrusion device 24 extrudes the air inside it through the channel 23 into the accommodation cavity formed by the elastic sleeve 21 and the annular groove. At this time, the elastic sleeve 21 deforms and expands. Since the annular cavity is in a relatively sealed state after the injection head body 1 is inserted, the air in the annular cavity cannot be discharged, which in turn causes the elastic sleeve 21 to be unable to expand. To avoid the above situation, an exhaust hole 32 is opened on the mounting seat 3. In this way, when the elastic sleeve 21 expands, the air in the annular cavity can be discharged through the exhaust hole 32. At the same time, a switching valve 33 is provided on the exhaust hole 32. After the elastic shell expands for a period of time, the switching valve 33 is closed. In this way, the pressure of the expanded elastic sleeve 21 can be maintained, avoiding the elastic sleeve 21 expanding and contracting synchronously due to the pressure fluctuation in the injection pipeline of the injection head body 1 during the injection process, and ensuring the stability of the elastic sleeve 21 during sealing.

[0047] Referring to Figures 1 - 10 : The present invention also relates to an injection molding machine, including an anti-loosening and liquid-leakage injection head with an elastic locking mechanism.

[0048] The above embodiments only represent one or several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An anti-loosening and anti-leakage injection molding head with an elastic locking mechanism, comprising an injection molding head body (1), a locking and anti-leakage device (2), a mounting seat (3) and a connecting pipe (4); It is characterized in that The locking and leak-proof device (2) comprises an elastic sleeve (21), a supporting device (211), an annular groove (22), a channel (23), a pressing device (24), a clamping device (25) and a connecting device (26); The annular groove (22) is formed on the side wall of the injection head body (1) around the axis of the injection head body (1); A plug hole (31) is horizontally penetrated on the mounting seat (3), the injection head body (1) is plugged into and matched with the plug hole (31), an annular cavity is formed on the inner wall of the plug hole (31) around the axis of the plug hole (31), the elastic sleeve (21) is fixedly arranged on the annular groove (22) along the axis of the injection head body (1), and the elastic sleeve (21) and the annular groove (22) form a receiving cavity; The support device (211) is arranged on the injection head body (1), and the support device (211) supports the inner wall of the elastic sleeve (21); The injection head body (1) is provided with an injection pipe running through it along its axis, and the extrusion device (24) is arranged on the inner wall of the injection pipe; The channel (23) is arranged in the injection head body (1), and the two ends of the channel (23) are respectively connected to the extrusion device (24) and the accommodating cavity, and the extrusion device (24) can discharge air into the accommodating cavity after being extruded; The clamping device (25) is arranged on the outer wall of the injection head body (1), and the clamping device (25) can be clamped and matched with the inner wall of the insertion hole (31); The connecting device (26) is arranged at the rear of the injection head body (1), and the connecting device (26) is used to connect the connecting pipe (4) and the injection head body (1); The extrusion device (24) comprises an extrusion groove (241), an extrusion plate (242) and a first spring (243); The extrusion groove (241) is formed on the side wall of the injection pipe along the radial direction of the injection head body (1); The extrusion plate (242) is slidably disposed in the extrusion groove (241) along the extension direction of the extrusion groove (241), a first gap exists between the extrusion plate (242) and the bottom of the extrusion groove (241), and the extrusion groove (241) and the channel (23) are communicated with each other; The first spring (243) is arranged in the first gap; The clamping device (25) comprises a clamping block (251), a second spring (252), a groove (253) and a clamping slot; The groove (253) is formed on the side wall of the injection head body (1) along the radial direction of the injection head body (1), and an electromagnet is arranged at the bottom of the groove (253); The clamping block (251) is slidably disposed in the groove (253) along the extension direction of the groove (253), and a second gap exists between the clamping block (251) and the bottom of the groove (253); The second spring (252) is disposed in the second gap; The clamping groove is formed on the inner wall of the insertion hole (31), and the clamping block (251) is clamped and matched with the clamping groove; The connecting device (26) comprises a connecting piece (261), a limiting assembly (262), a self-locking device (263) and a nut (264); The connecting piece (261) is a cylindrical structure, and is arranged at the rear of the injection head body (1). The connecting piece (261) is threadably matched with the injection head body (1). The limiting component (262) is arranged on a side of the connecting piece (261) away from the injection head body (1); The self-locking device (263) is respectively arranged on the connecting piece (261) and the injection head body (1), and the self-locking device (263) can lock the connecting piece (261); The nut (264) is fixedly connected to an end of the connecting piece (261) away from the injection head body (1) along the axis of the connecting piece (261), and an end of the nut (264) away from the connecting piece (261) is connected to the connecting pipe (4).

2. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 1, characterized in that: The supporting device (211) comprises a supporting rod (2111), a supporting plate (2112) and a sliding groove (2113); The slide groove (2113) is provided on the injection head body (1) along the radial direction of the injection head body (1), and the slide groove (2113) is located in the receiving groove; The support rod (2111) is slidably disposed in the slide groove (2113) along the length direction of the slide groove (2113); The support plate (2112) is fixedly arranged at one end of the support rod (2111) away from the injection head body (1), and the support plate (2112) is fixedly connected to the inner wall of the elastic sleeve (21).

3. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 2, characterized in that: The locking and leak-proof device (2) further comprises a protective element (212); A plurality of protective pieces (212) are provided, and the protective pieces (212) are arranged around the axis of the injection head body (1) on one side of the elastic sleeve (21) close to the output end of the injection head body (1), and the protective pieces (212) have a heat insulation function.

4. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 1, characterized in that: The self-locking device (263) comprises a self-locking block (2631), a protruding block (2632), a self-locking groove (2633), a third spring (2634) and a pushing block (2635); The self-locking groove (2633) is provided at the rear of the injection head body (1) along the axis of the injection head body (1); The self-locking block (2631) is slidably disposed in the self-locking groove (2633) along the length direction of the self-locking groove (2633), and a third gap exists between the self-locking block (2631) and the bottom of the self-locking groove (2633); A third spring (2634) is disposed in the third gap; The protrusion (2632) is fixedly arranged on the side wall of the connecting piece (261), and the protrusion (2632) can be restricted by the self-locking block (2631); The pushing block (2635) is arranged on the upper part of the self-locking block (2631), and the pushing block (2635) can drive the self-locking block (2631) to slide along the length direction of the self-locking groove (2633).

5. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 1, characterized in that: The limiting assembly (262) comprises a limiting frame (2621), a limiting rod (2622) and an extension ear (2623); The limiting frame (2621) is arranged on a side of the connecting piece (261) away from the injection head body (1); The limiting rod (2622) is fixedly arranged on the limiting frame (2621) along the axis of the injection head body (1); The extension ear (2623) is fixedly arranged on the side wall of the injection head body (1), and the limiting rod (2622) can penetrate the extension ear (2623) and slideably cooperate with the extension ear (2623).

6. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 2, characterized in that: An exhaust hole (32) is vertically penetrated through the mounting seat (3), the exhaust hole (32) is communicated with the annular cavity, and an on-off valve (33) is arranged on the upper part of the exhaust hole (32).

7. An injection molding machine, characterized in that: It comprises an anti-loosening and liquid leakage injection molding head with an elastic locking mechanism as described in any one of claims 1 to 6.

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