Loosening and liquid leakage preventing injection molding head with elastic locking mechanism and injection molding machine

Abstract

The invention relates to the technical field of injection molding heads, in particular to an anti-loosening and anti-liquid-leakage injection molding head with an elastic locking mechanism and an injection molding machine. The anti-loosening and anti-liquid-leakage injection molding head comprises an injection molding head body, a locking and anti-leakage device, a mounting seat and a connecting pipe; the annular groove is formed in the side wall of the injection molding head body around the axis of the injection molding head body; the elastic sleeve is fixedly arranged on the annular groove along the axis of the injection molding head body, and the elastic sleeve and the annular groove form a containing cavity; the supporting device is arranged on the injection molding head body; an injection pipeline penetrates through the injection molding head body along the axis of the injection molding head body; the extrusion device is arranged on the inner wall of the injection pipeline; the channel is formed in the injection molding head body, and the two ends of the channel communicate with the extrusion device and the containing cavity correspondingly; the clamping device is arranged on the outer wall of the injection molding head body and can be clamped and matched with the inner wall of the insertion hole; the connecting device is arranged at the tail part of the injection molding head body. The sealing performance of a gap between the injection molding head body and the insertion hole is guaranteed.

Description

Technical Field

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

[0002] Injection molding is a method of producing industrial products; products usually use rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding and die casting; injection molding machine is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting materials; an injection head is installed on the injection molding machine. However, as far as the injection molding head used in the current traditional injection molding machine is concerned, the injection molding head is easy to loosen, and then after the injection molding head is loosened, it is easy to cause leakage during the injection molding process; secondly, when the injection molding head is subjected to excessive force during use, it is easy to cause breakage and leakage.

[0003] Chinese patent application CN115489078A discloses a leak-proof 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 plugged into the injection molding equipment, and the tail end of the injection head body is threadedly connected to a connector; an auxiliary groove is provided 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, a rotating shaft, a locking sheet, a coil spring and an elastic member, and the ratchet is welded to the connector; the auxiliary part is composed of an auxiliary seat, a socket, a mounting seat and an insertion 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 scheme can prevent leakage of the injection head itself, it cannot guarantee that when the injection head is inserted into the injection cavity, leakage will not occur in the gap between the injection head and the jack on the injection cavity. Moreover, when connecting the connector and the injection head body, the connecting force between the connector and the injection head body is too dependent on the workers' installation experience. If the installation is too tight, it is not convenient to disassemble and replace. If the installation is too loose, leakage is likely to occur. Summary of the invention

[0005] In view of the above problems, an anti-loosening and anti-leakage injection molding head with an elastic locking mechanism and an injection molding machine are provided. The injection molding head body is inserted into the socket of the mounting seat, and the clamping device arranged on the injection molding head body will be clamped with the mounting seat to ensure that the injection molding head body will not slip out of the socket during injection. When the injection molding head body is performing injection molding, molten material will pass through the injection pipe arranged in the injection molding head body. The molten material will push the extrusion device, so that the extrusion device discharges the air inside it through the through groove into the receiving groove formed by the elastic sleeve and the annular groove. As the extrusion device is continuously extruded, the air in the extrusion device will also continuously enter the receiving groove, so that The elastic sleeve expands, and the expanded elastic sleeve fills the annular cavity, so that self-sealing can be achieved. This is because when the 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 that the molten material can be injected into the injection cavity. At this time, the extrusion device will be further squeezed, which makes the elastic sleeve expand more. At this time, the internal and external pressures of the elastic sleeve are basically the same, so the molten material in the injection cavity will not flow out from the gap between the injection head body and the socket, ensuring the sealing of the gap between the injection head body and the socket.

[0006] In order to solve the problems of the prior art, the present invention provides an anti-loosening and anti-leakage injection molding head with an elastic locking mechanism, comprising an injection molding head body, a locking and anti-leakage device, a mounting seat and a connecting pipe; the locking and anti-leakage device comprises an elastic sleeve, a supporting device, an annular groove, a channel, an extruding device, a clamping device and a connecting device; the annular groove is arranged on the side wall of the injection molding head body around the axis of the injection molding head body; a plug hole is horizontally penetrated on the mounting seat, the injection molding head body is plugged and matched with the plug hole, an annular cavity is arranged on the inner wall of the plug hole around the axis of the plug hole, the elastic sleeve is fixedly arranged on the annular groove along the axis of the injection molding head body, and the elastic sleeve and The annular groove forms an accommodating cavity; the supporting device is arranged on the injection head body, and the supporting device supports the inner wall of the elastic sleeve; the injection head body is provided with an injection pipe along its own axis, and the extrusion device is arranged on the inner wall of the injection pipe; the channel is arranged in the injection head body, and the two ends of the channel are respectively connected with the extrusion device and the accommodating cavity, and the extrusion device can discharge air into the accommodating cavity after being squeezed; 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 socket; 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, and there is a first gap between the extrusion plate and the bottom of the extrusion groove, and the extrusion groove and the channel are connected to each other; 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 groove; the groove is opened on 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 extension 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 groove is opened on the inner wall of the socket, and the clamping block and the clamping groove are clamped together.

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

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

[0011] Preferably, the connecting device includes a connecting piece, a limiting assembly, a self-locking device and a nut; the connecting piece is a cylindrical structure, the connecting piece is arranged at the tail of the injection molding head body, and the connecting piece is threadedly matched with the injection molding head body; the limiting assembly is arranged on the side of the connecting piece away from the injection molding head body; the self-locking device is respectively arranged on the connecting piece and the injection molding head body, and the self-locking device can lock the connecting piece; the nut is fixedly connected to one end of the connecting piece away from the injection molding head body along the axis of the connecting piece, and the end of the nut away from the connecting piece is connected to the connecting pipe.

[0012] Preferably, the self-locking device includes a self-locking block, a protrusion, a self-locking groove, a third spring and a pushing block; the self-locking groove is arranged at the tail end of the injection molding head body along the axis of the injection molding head body; the self-locking block is slidably arranged in the self-locking groove along the length direction of the self-locking groove, and there is a third gap between the self-locking block and the bottom of the self-locking groove; the third spring is arranged in the third gap; the protrusion is fixedly arranged on the side wall of the connecting piece, and the protrusion 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 groove.

[0013] Preferably, the limit assembly includes a limit frame, a limit rod and an extension ear; the limit frame is arranged on the side of the connecting piece away from the injection head body; the limit rod is fixedly arranged on the limit 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 limit rod can pass through the extension ear and slide with the extension ear.

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

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

[0016] Compared with the prior art, the present invention has the following beneficial effects: the present invention inserts the injection head body into the socket of the mounting seat by arranging an elastic sleeve, a supporting device, an annular groove, a channel, an extruding device, a clamping device and a connecting device; the clamping device arranged on the injection head body can be clamped with the mounting seat to ensure that the injection head body will not slip out of the socket during injection; when the injection head body is performing injection molding, molten material will pass through the injection pipe arranged in the injection head body, and the molten material will push the extruding device, so that the extruding device discharges the air inside it through the through groove into the receiving groove formed by the elastic sleeve and the annular groove; as the extruding device is continuously extruded, the air in the extruding device will also continuously enter the In the accommodating groove, the elastic sleeve is expanded, and the expanded elastic sleeve fills the annular cavity, so that self-sealing can be achieved. This is because when the 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 squeezed, so that the elastic sleeve expands more strongly. At this time, the internal and external pressures of the elastic sleeve are basically the same, so the molten material in the injection cavity will not flow out from the gap between the injection head body and the socket, thereby ensuring the sealing of the gap between the injection head body and the socket. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of an anti-loosening and leakage injection molding head with an elastic locking mechanism after being inserted into a mounting seat; Figure 2 It is a three-dimensional schematic diagram of an anti-loosening and anti-leakage injection molding head with an elastic locking mechanism; Figure 3 It is an anti-loosening and leaking injection molding head with elastic locking mechanism. Figure 2 A local enlarged schematic diagram of the middle A; Figure 4 It is an anti-loosening and leaking injection molding head with elastic locking mechanism. Figure 2 A partial enlarged schematic diagram of point B in the middle; Figure 5 It is a three-dimensional schematic diagram of an anti-loosening and leakage injection molding head with an elastic locking mechanism, with the connecting pipe and part of the connecting device removed; Figure 6 It is a side view of an anti-loosening and leaking injection molding head with an elastic locking mechanism; Figure 7 It is an anti-loosening and leaking injection molding head with elastic locking mechanism. Figure 6 Schematic cross-sectional view at CC in the middle; Figure 8 It is an anti-loosening and leaking injection molding head with elastic locking mechanism. Figure 7 A partial enlarged schematic diagram of point D in the middle; Fig. 9 It is an anti-loosening and leaking injection molding head with elastic locking mechanism. Figure 7 A partial enlarged schematic diagram of point E in the middle; Fig.10 The invention discloses a stereoscopic schematic diagram of an anti-loosening and leakage injection molding head with an elastic locking mechanism, with the elastic sleeve, a connecting pipe and part of the connecting device removed.

[0018] The numbers in the figure are: 1-injection head body; 2-locking and leak-proof device; 21-elastic sleeve; 211-support device; 2111-support rod; 2112-support plate; 2113-slide; 212-protective member; 22-ring 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 piece; 262-limiting assembly; 2621-limiting frame; 2622-limiting rod; 2623-extension ear; 263-self-locking device; 2631-self-locking block; 2632-bump; 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 DESCRIPTION

[0019] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] Reference Figure 1 , Figure 2 , Figure 7 , Figure 8 and Fig.10: An anti-loosening and leakage injection molding head with an elastic locking mechanism, comprising an injection molding 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 comprises an elastic sleeve 21, a supporting device 211, an annular groove 22, a channel 23, an extruding device 24, a clamping device 25 and a connecting device 26; the annular groove 22 is arranged on the side wall of the injection molding head body 1 around the axis of the injection molding head body 1; a plug hole 31 is horizontally penetrated on the mounting seat 3, the injection molding head body 1 is plugged and matched with the plug hole 31, an annular cavity is arranged 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 molding head body 1, and the elastic sleeve 21 and the annular groove 22 are shaped 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 along its own 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 with the extrusion device 24 and the accommodating cavity, and the extrusion device 24 can discharge the air into the accommodating cavity after being squeezed; the clamping device 25 is arranged on the outer wall of the injection head body 1, and the clamping device 25 can be clamped 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 to connect the connecting pipe 4 and the injection head body 1.

[0021] An injection cavity is provided on one side of the mounting seat 3. The injection cavity is a place for injection molding of molten material, that is, the injection head body 1 needs to inject the molten material into the injection cavity first. When in use, the injection head body 1 is inserted into the socket 31 of the mounting seat 3, and the clamping device 25 provided on the injection head body 1 will be clamped with the mounting seat 3 to ensure that the injection head body 1 will not slip out of the socket 31 during injection. When the injection head body 1 is performing injection molding, molten material will pass through the injection pipe provided in the injection head body 1. 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 receiving 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 receiving groove, so that the elastic sleeve 21 will expand, and the expanded elastic sleeve 21 will fill the annular cavity, so that self-sealing can be achieved. This is because when the molten material appears from the gap between the plug and the injection head body 1, the elastic sleeve 21 will be filled with the annular cavity, so that self-sealing can be achieved. This is because when the molten material appears from the gap between the plug and the injection head body 1, the elastic sleeve 21 will be filled with the annular cavity, so that self-sealing can be achieved. When the liquid flows out from the gap, the pressure in the injection cavity is very high. Similarly, the pressure in the injection pipe of the injection head body 1 is also very high, so that the molten material can be injected into the injection cavity. At this time, the extrusion device 24 will be further extruded, so that the elastic sleeve 21 will expand more strongly. At this time, the internal and external pressures of the elastic sleeve 21 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 1 and the socket 31, thereby ensuring the sealing of the gap between the injection head body 1 and the socket 31. The connecting device 26 arranged 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 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 is finally discharged into the injection cavity for injection molding.

[0022] Reference 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, and there is a first gap between the extrusion plate 242 and the bottom of the extrusion groove 241, and the extrusion groove 241 is connected with the channel 23; the first spring 243 is arranged in the first gap.

[0023] 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 is compressed, and the air in the extrusion groove 241 enters the accommodating cavity formed by the elastic sleeve 21 and the annular groove 22 through the channel 23 under the extrusion of the extrusion plate 242, thereby causing the elastic sleeve 21 to gradually expand.

[0024] Reference 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 arranged 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 extension 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 arranged on the inner wall of the jack 31, and the clamping block 251 and the clamping groove are clamped together.

[0025] After the injection head body 1 is inserted into the socket 31, the snap-fit ​​block 251 arranged on the injection head body 1 will be snap-fitted with the snap-fit ​​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 snap-fitting of the snap-fit ​​block 251 and the snap-fit ​​groove can prevent the injection head body 1 from sliding along its own axis, thereby ensuring that the elastic sleeve 21 will not be damaged after expansion, and ensuring that the elastic sleeve 21 can achieve normal sealing.

[0026] Reference Figure 7 , Fig. 9 and Fig.10 : The supporting device 211 includes a supporting rod 2111, a supporting plate 2112 and a slide groove 2113; the slide groove 2113 is opened 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 accommodating groove; the support rod 2111 is slidably set in the slide groove 2113 along the length direction of the slide groove 2113; the support plate 2112 is fixedly set 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.

[0027] When the elastic sleeve 21 expands, the elastic sleeve 21 will drive the support rod 2111 to slide out of the slide groove 2113. The expansion of the elastic sleeve 21 will be subjected to an axial thrust along the injection head body 1. Although supported by the clamping device 25, 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 support rod 2111 is provided, it can be ensured that the elastic sleeve 21 is not easily deformed along the axial direction of the injection head body 1, thereby ensuring the resistance of the elastic sleeve 21 to the outflow of the molten material. Otherwise, if the support rod 2111 is not provided, due to the elastic characteristics of the elastic sleeve 21, there is still 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.

[0028] Reference Figure 5 : The locking and leak-proof device 2 also includes a protective member 212; a plurality of protective members 212 are provided, and the protective member 212 is 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 member 212 has a heat insulation function.

[0029] The protective member 212 is provided to ensure that the high temperature of the molten material will not act on the elastic sleeve 21 through the gap between the insertion hole 31 and the injection head body 1, thereby preventing the elastic sleeve 21 from being damaged after being exposed to high temperature, thereby reducing the sealing performance of the elastic sleeve 21.

[0030] Reference Figure 1 , Figure 5 and Figure 7 : The connecting device 26 includes 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 the connecting piece 261 is arranged at the tail of the injection head body 1, and the connecting piece 261 is threadedly matched with the injection head body 1; the limiting assembly 262 is arranged on the 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 the end of the connecting piece 261 away from the injection head body 1 along the axis of the connecting piece 261, and the end of the nut 264 away from the connecting piece 261 is connected to the connecting pipe 4.

[0031] During installation, the limit component 262 is set at the tail of the injection head body 1. The limit component 262 can provide support for the connecting piece 261. Then the connecting piece 261 is rotated to connect the connecting piece 261 to the injection head body 1. In order to ensure that the injection head body 1 and the connecting pipe 4 will not leak after installation, it is necessary to ensure that the connecting piece 261 and the injection head body 1 are tightened enough. In this way, after manually screwing the connecting piece 261 into the injection head body 1, it is necessary to use a wrench to rotate the nut 264, and the connecting piece 261 is driven to rotate by the nut 264. When the connecting piece 261 is fully threaded with the injection head body 1, the self-locking device 263 will realize self-locking of the connecting piece 261 to prevent the connecting piece 261 from rotating.

[0032] Reference Figure 4 and Figure 5 :The self-locking device 263 includes a self-locking block 2631, a protrusion 2632, a self-locking groove 2633, a third spring 2634 and a pushing block 2635; the self-locking groove 2633 is arranged at the tail of the injection head body 1 along the axis 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 protrusion 2632 is fixedly arranged on the side wall of the connecting member 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.

[0033] When the connecting member 261 rotates, the protrusion 2632 set on the connecting member 261 will also rotate synchronously. When the self-locking block 2631 is pressed down as the connecting member 261 rotates continuously, it means that the connecting member 261 is about to be completely threaded with the injection head body 1. When the connecting member 261 can no longer be rotated by the nut 264, the protrusion 2632 contacts the tail of the injection head body 1, thereby hindering the rotation of the connecting member 261. At the same time, the self-locking block 263 1 will also restrict the protrusion 2632, so that the connecting member 261 cannot rotate in the opposite direction, thereby preventing the connecting member 261 from loosening. When the injection head body 1 needs to be replaced, it is only necessary to push the pushing block 2635 so that the pushing 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, the self-locking block 2631 no longer restricts the protrusion 2632, and the connecting member 261 can also be taken out from the injection head body 1.

[0034] Reference Figure 2 and Figure 3 : The limiting assembly 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 the extension ear 2623 and slide with the extension ear 2623.

[0035] Before installing the connecting piece 261 on the injection head body 1, it is necessary to make the limiting rod 2622 pass through the extension ear 2623, and then screw the connecting piece 261 into the injection head body 1. However, the force of manual screwing is limited. At this time, a wrench is needed to screw the nut 264, and the limiting rod 2622 and the limiting frame 2621 provide support for the rotation of the nut 264 and the connecting piece 261, ensuring that the nut 264 can stably drive the connecting piece 261 to rotate.

[0036] Reference Figure 7 An exhaust hole 32 is vertically penetrated through the mounting seat 3 , the exhaust hole 32 is communicated with the annular cavity, and a switch valve 33 is arranged on the upper part of the exhaust hole 32 .

[0037] When the injection head body 1 starts to inject the molten material into the injection cavity, the extrusion device 24 is squeezed, and the extrusion device 24 squeezes the air inside it into the accommodating cavity formed by the elastic sleeve 21 and the annular groove through the channel 23. At this time, the elastic sleeve 21 is deformed and expanded. 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 leads to the inability of the elastic sleeve 21 to expand. In order 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 switch valve 33 is arranged on the exhaust hole 32. After the elastic shell expands for a period of time, the switch valve 33 is closed, so that the expanded elastic sleeve 21 can be pressurized, which avoids the pressure in the injection pipe in the injection head body 1 fluctuating during the injection process, causing the elastic sleeve 21 to expand and contract synchronously, thereby ensuring the stability of the elastic sleeve 21 when sealing.

[0038] Reference Figure 1-Figure 10 The present invention also relates to an injection molding machine, comprising an anti-loosening and leakage injection molding head with an elastic locking mechanism.

[0039] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached 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); 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), an extruding device (24), a clamping device (25) and a connecting device (26); the annular groove (22) is provided on the side wall of the injection head body (1) around the axis of the injection head body (1); a plug hole (31) is provided horizontally through the mounting seat (3); the injection head body (1) and the plug hole (31) are plugged and matched; an annular cavity is provided on the inner wall of the plug hole (31) around the axis of the plug hole (31); the elastic sleeve (21) is fixedly provided on the annular groove (22) along the axis of the injection head body (1); the elastic sleeve (21) and the annular groove (22) form a receiving cavity; the supporting device (211) is provided on the injection head body (1), the supporting device (211) supports the inner wall of the elastic sleeve (21); the injection head body (1) is provided with an injection pipe 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 with the extrusion device (24) and the accommodating cavity, and the extrusion device (24) can discharge air into the accommodating cavity after being squeezed; 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 jack (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).

2. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 1, characterized in that: The extrusion device (24) comprises an extrusion groove (241), an extrusion plate (242) and a first spring (243); the extrusion groove (241) is provided 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); a first gap exists between the extrusion plate (242) and the bottom of the extrusion groove (241); the extrusion groove (241) and the channel (23) are connected to each other; and the first spring (243) is arranged in the first gap.

3. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 1, characterized in that: The clamping device (25) comprises a clamping block (251), a second spring (252), a groove (253) and a clamping groove; the groove (253) is provided on the side wall of the injection head body (1) along the radial direction of the injection head body (1), and an electromagnet is provided at the bottom of the groove (253); the clamping block (251) is slidably provided 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 provided in the second gap; the clamping groove is provided on the inner wall of the insertion hole (31), and the clamping block (251) and the clamping groove are clamped and matched.

4. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 3, characterized in that: The support device (211) comprises a support rod (2111), a support plate (2112) and a slide 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 arranged 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).

5. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 4, characterized in that: The locking and leak-proof device (2) further comprises a protective member (212); a plurality of protective members (212) are provided, and the protective members (212) are arranged around the axis of the injection head body (1) on a 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.

6. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 4, characterized in that: 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, the connecting piece (261) is arranged at the rear of the injection head body (1), and the connecting piece (261) and the injection head body (1) are threadedly matched; the limiting assembly (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 one end of the connecting piece (261) away from the injection head body (1) along the axis of the connecting piece (261), and one end of the nut (264) away from the connecting piece (261) is connected to the connecting pipe (4).

7. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 6, characterized in that: The self-locking device (263) comprises a self-locking block (2631), a protrusion (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 molding head body (1) along the axis of the injection molding 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); the self-locking block (2631) and the self-locking groove (2633) are connected to each other. A third gap exists between the bottom of the groove (2633); the third spring (2634) is arranged in the third gap; the protrusion (2632) is fixedly arranged on the side wall of the connecting member (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).

8. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 6, 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 slidably cooperate with the extension ear (2623).

9. The anti-loosening and liquid leakage injection molding head with elastic locking mechanism according to claim 4, 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).

10. An injection molding machine, characterized in that: It comprises an anti-loosening and leakage injection molding head with an elastic locking mechanism as described in any one of claims 1 to 9.

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