Valve needle dismounting device and hot runner system thereof

Abstract

The utility model provides a valve needle dismounting device and a hot runner system thereof, the valve needle dismounting device is used for dismounting a valve needle, the valve needle comprises a needle head and a valve rod, the valve needle dismounting device comprises a connecting piece, the connecting piece comprises a pulling head and a fixing part which are connected with each other, and the fixing part is detachably connected with the valve rod; and the locking piece is arranged around the fixing part and can move in the axial direction of the fixing part. And if the valve needle needs to be disassembled, the fixing part in the connecting rod is connected with the valve rod of the valve needle, and then the locking piece is moved to the circumferential outer side of the valve rod and the fixing part, so that the valve needle is prevented from falling off. And the valve needle is pulled out under the action of external force. According to the valve needle dismounting device, the adaptability between the connecting piece of the valve needle dismounting device and the valve rod of the valve needle is high, the locking piece plays a locking role, and the valve needle dismounting device and the valve needle are tightly connected in the valve needle dismounting process, so that the valve needle can be pulled out at a time, the possibility that the valve needle falls off and is damaged is reduced, and meanwhile the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot runner technology field especially relates to a valve needle dismounting device and hot runner system thereof. BACKGROUND

[0002] At present, the injection mold widely used in injection industry is hot runner injection mold, compared with common mold, the plastic product quality of hot runner system injection is higher, and hot runner system has the advantages of saving raw materials, improving production efficiency, high degree of automation etc.

[0003] In the process of plastic injection molding, hot runner system is used to deliver molten plastic from injection machine nozzle to the cavity of mold. The valve needle is a key part in the hot runner system, which is used to control the opening and closing of the gate. By opening and closing the valve needle, the timing and quantity of plastic melt entering the cavity can be accurately controlled. At the beginning of injection, the valve needle retreats, opens the hot nozzle glue opening, and lets the melt enter the cavity; at the end of injection, the valve needle closes, closes the glue opening, and completes a injection operation. Therefore, the valve needle type hot runner system can artificially control the opening and closing time of the gate, so that the gate is smooth and flat, thereby improving the product quality. Since the valve needle closes the gate by mechanical action, it is not limited by the cooling time of the plastic at the gate, and sometimes the production cycle of the plastic part can be greatly shortened. Therefore, the valve needle needs to be maintained or replaced regularly, otherwise it cannot be matched with the gate. When the valve needle needs to be maintained or replaced, it needs to be disassembled from the hot runner system.

[0004] However, in the prior art, if the valve needle is to be removed, the cylinder needs to be removed, the resin in the hot runner system needs to be melted by heating, and then the valve needle needs to be pulled out of the valve needle guide sleeve by clamping it with a pointed forceps tool. However, in the operation mode of the prior art, the pointed forceps is easy to slip, the force is not easy to be coaxial with the valve needle, resulting in low disassembly quality, poor efficiency, and easy damage to the valve needle.

[0005] Therefore, it is necessary to design a valve needle dismounting device and hot runner system thereof which has high dismounting efficiency and is not easy to damage the valve needle. SUMMARY

[0006] To solve the technical problem that the use of pointed forceps to dismount the valve needle in the prior art easily causes low dismounting efficiency and damage to the valve needle, the purpose of the utility model is to provide a new valve needle dismounting device and hot runner system thereof.

[0007] To achieve one of the purposes of the utility model, an embodiment of the utility model provides a valve needle dismounting device for dismounting a valve needle, the valve needle comprising a needle head and a valve rod, and the valve needle dismounting device comprising:

[0008] A connecting piece comprising a pulling head and a fixed part connected to each other, the fixed part being detachably connected to the valve rod;

[0009] A locking member is arranged around the fixing portion and is movable along the axial direction of the fixing portion.

[0010] As a further improvement of an embodiment of the present application, the pull head is in a columnar shape, and the pull head comprises a first top surface, a second top surface arranged opposite to the first top surface, and a first peripheral surface connecting the first top surface and the second top surface, and the second top surface is in abutment with the fixing portion.

[0011] As a further improvement of an embodiment of the present application, the first top surface of the pull head is recessed inward along the axial direction thereof to form a first receiving space.

[0012] As a further improvement of an embodiment of the present application, the valve needle dismounting device further comprises a power member, the power member is movable along the extension direction of the valve needle, and the power member comprises a gun head matched with the pull head.

[0013] As a further improvement of an embodiment of the present application, the fixing portion is in a columnar shape, and the fixing portion comprises a third top surface, a fourth top surface arranged opposite to the third top surface, and a second peripheral surface connecting the third top surface and the fourth top surface, and the third top surface is in abutment with the pull head.

[0014] As a further improvement of an embodiment of the present application, the second peripheral surface of the fixing portion is recessed inward along the radial direction thereof to the axial center thereof to form a second receiving space, and the recessed shape of the second receiving space is matched with the valve stem.

[0015] As a further improvement of an embodiment of the present application, the fixing portion is divided into a first fixing layer and a second fixing layer, and the second receiving space is located in the second fixing layer.

[0016] As a further improvement of an embodiment of the present application, the second peripheral surface of the first fixing layer and the second fixing layer is provided with external threads, and the inner surface of the locking member is provided with internal threads.

[0017] As a further improvement of an embodiment of the present application, the pull head and the fixing portion are detachably arranged or fixedly connected.

[0018] To achieve one of the above-mentioned purposes, an embodiment of the present application provides a valve needle dismounting device comprising the above-mentioned valve needle dismounting device.

[0019] Compared with the prior art, the utility model has the following beneficial effects: in this embodiment, if the valve needle needs to be disassembled, the fixed portion in the connecting rod is connected with the valve rod of the valve needle, then the locking piece is moved to the circumferential outside of the valve rod and the fixed portion to prevent the valve needle from falling off. Further, under the action of external force, the valve needle is pulled out. The connecting piece of the valve needle dismounting device and the valve rod of the valve needle have strong adaptability, and the locking piece plays a locking role, the valve needle dismounting device and the valve needle are tightly connected during the process of dismounting the valve needle, so that the valve needle can be pulled out at one time, the possibility of falling off and damage of the valve needle is reduced, and the work efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is the perspective view of part of the valve needle dismounting device and the valve needle of an embodiment of the utility model;

[0021] Fig. 2 is the perspective view of the valve needle dismounting device of an embodiment of the utility model;

[0022] Fig. 3 is the bottom surface structure schematic view of the valve needle dismounting device of an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The utility model will be described in detail below in combination with the specific implementation shown in the drawings. But these implementation does not limit the utility model, the conversion of structure, method or function that the ordinary skill in the art makes according to these implementation is included in the protection scope of the utility model.

[0024] As Figs. 1 to 3 Shown, the utility model provides a kind of valve needle dismounting device 100 and hot runner system thereof.The valve needle dismounting device 100 is used to disassemble valve needle 90, the valve needle 90 includes needle head and valve rod 91, the valve needle dismounting device 100 includes:

[0025] Connecting piece 10, the connecting piece 10 includes pull head 1 and fixed portion 2 connected with each other, the fixed portion 2 can be detachably connected with the valve rod 91;

[0026] Locking piece 3, the locking piece 3 is arranged around the fixed portion 2 and can be moved along the axial direction of the fixed portion 2.

[0027] Thus, in the embodiment, the valve needle dismounting device 100 comprises a connecting piece 10 and a locking piece 3, the connecting piece 10 has a fixed part 2 which can be detachably connected with the valve needle 90. Thus, if it is needed to dismount the valve needle 90, the fixed part 2 in the connecting rod is connected with the valve rod 91 of the valve needle 90, and then the locking piece 3 is moved to the circumferential outside of the valve rod 91 and the fixed part 2 to prevent the valve needle 90 from falling off. Then the valve needle 90 is pulled out under the action of external force. The connecting piece 10 of the valve needle dismounting device 100 and the valve rod 91 of the valve needle 90 have strong adaptability, and the locking piece 3 plays a locking role. The valve needle dismounting device 100 and the valve needle 90 are tightly connected during the process of dismounting the valve needle 90, so that the valve needle 90 can be pulled out at one time, reducing the possibility of falling off and damage of the valve needle 90, and improving the work efficiency.

[0028] Of course, as shown in the drawings, the valve needle dismounting device 100 also comprises a power piece 4 which moves along the extension direction of the valve needle 90, and the power piece 4 comprises a gun head 41 which is adapted to the pull head 1. Thus, in the case that the valve rod 91 and the fixed part 2 are fixedly connected, the gun head 41 of the power piece 4 is also fixedly connected with the pull head 1 and is pulled out along the extension direction of the valve needle 90, i.e. the axial direction, and the force applied by the power piece 4 to the pull head 1 is in the same axis as the valve needle 90, so that the stability of the valve needle 90 during the pulling-out process can be effectively increased, and the valve needle 90 can also be prevented from being damaged. Fig. 2

[0029] The pull head 1 is in a columnar shape, and the pull head 1 comprises a first top surface 11, a second top surface 12 which is oppositely arranged with the first top surface 11, and a first circumferential surface 13 which connects the first top surface 11 and the second top surface 12, and the second top surface 12 is in abutment with the fixed part 2. In the specific embodiment, the pull head 1 is in a cylindrical shape, and the size and shape of the first top surface 11 and the second top surface 12 are completely consistent.

[0030] Specifically, the first top surface 11 of the pull head 1 is recessed inward along the axial direction to form a first accommodation space 101, so that the first accommodation space 101 is open to the top, i.e. the direction of the power piece 4. As described above, the power piece 4 is adapted to the pull head 1, so that the gun head 41 of the power piece 4 is detachably connected with the first accommodation space 101. When it is needed to pull out the valve needle 90, the gun head 41 of the power piece 4 can be adaptively inserted into the first accommodation space 101 and locked with the pull head 1, so that the power piece 4 moves outward and applies an upward force to the connecting piece 10 and the valve needle 90 to pull out the valve needle 90.

[0031] ​In this specific embodiment, both the interior of the first receiving space 101 of the puller 1 and the nozzle 41 of the power component 4 are rigid structures to apply a stable force to the connector 10. Furthermore, the first receiving space 101 within different pullers 1 also has different structures and forms to adapt to different nozzles 41. Before the operation begins, it is necessary to select a connector 10 or puller 1 with different structures and forms according to the nozzle 41 of the power component 4, so as to apply upward and outward forces to the valve needle 90 more efficiently and conveniently.

[0032] The fixing part 2 is cylindrical and includes a third top surface 21, a fourth top surface 22 opposite to the third top surface 21, and a second peripheral surface 23 connecting the third top surface 21 and the fourth top surface 22. The third top surface 21 is in contact with the puller head 1. The fixing part 2 is also cylindrical, and the third top surface 21 and the fourth top surface 22 are the same size. The third top surface 21 is in contact with the second top surface 12 of the puller head 1. In this specific embodiment, the cross-sectional area of ​​the puller head 1 is larger than the cross-sectional area of ​​the fixing part 2, that is, the area of ​​the second top surface 12 is larger than the area of ​​the third top surface 21.

[0033] Alternatively, in this specific embodiment, such as Fig. 2 As shown, the third top surface 21 of the fixing part 2 is also recessed inward, and the inside of the pull head 1 is penetrated, so the pull head 1 and the fixing part 2 are combined to form the first receiving space 101, which is also within the protection scope of this utility model.

[0034] like Figs. 1 to 3 As shown, the second peripheral surface 23 of the fixing part 2 is recessed radially inward to its axis to form a second receiving space 201. The recessed shape of the second receiving space 201 is adapted to the valve stem 91. The second receiving space 201 is formed within the fixing part 2 and opens towards the bottom, i.e., the valve needle 90, and radially outward. Since the valve stem 91 of the valve needle 90 is usually irregularly designed, such as a structure that is thicker at the top and thinner at the bottom or vice versa, it is easy to get stuck if the valve needle 90 is assembled into the second receiving space 201 from bottom to top. Therefore, in this specific embodiment, before assembly, the valve stem 91 of the valve needle 90 first overlaps with the fixing part 2 in the vertical direction, and then the valve stem 91 slides into the fixing part 2 from the radially outward opening along the radial direction towards the axis. Furthermore, the recessed shape of the second receiving space 201 is adapted to the valve stem 91, so that the valve stem 91 can be assembled into the second receiving space 201 perfectly. During the subsequent disassembly process, the connector 10 can smoothly pull the valve needle 90 upwards.

[0035] The fixed part 2 or the connecting piece 10 can have different shapes of the second receiving space 201 to adapt to different valve needles 90. Before the operation step starts, different structures and forms of the fixed part 2 or the connecting piece 10 need to be selected according to the structure of the valve rod 91 in the valve needle 90 to be pulled out, so that the valve needle 90 can be better adapted and the damage to the valve needle 90 during pulling out is lower. For example Fig. 1 and Fig. 2 The structure of the second receiving space 201 is completely different.

[0036] As shown in Fig. 2 , the fixed part 2 can be divided into a first fixed layer 24 and a second fixed layer 25, and the second receiving space 201 is located in the second fixed layer 25. As described above, the locking piece 3 is arranged around the fixed part 2 and can move up and down along the axial direction of the fixed part 2. Therefore, when the connecting piece 10 is not assembled with the valve needle 90, the locking piece 3 moves up along the axial direction of the fixed part 2 to the outside of the first fixed layer 24, so that the locking piece 3 does not block the radial opening of the second receiving space 201, and the valve needle 90 is conveniently slid into the second receiving space 201 from the outside. After the connecting piece 10 and the valve needle 90 are assembled, the locking piece 3 moves down along the axial direction of the fixed part 2 to the outside of the second fixed layer 25, so as to block the radial outward opening of the second receiving space 201, thereby preventing the valve needle 90 from falling off.

[0037] Therefore, the width of the locking piece 3 is less than or equal to the width of the first fixed layer 24.

[0038] Specifically, the first fixed layer 24 and the second fixed layer 25 are both provided with external threads on the second circumferential surface 23, and the inner surface of the locking piece 3 is provided with internal threads. As shown in Fig. 2 , the locking piece 3 is a nut, which can rotate around the outside of the fixed part 2 and move up and down. Of course, since the second fixed layer 25 is provided with the second receiving space 201 with a radial outward opening, the second fixed layer 25 is not completely covered with external threads, but the thread structure is continuous and does not affect the up-and-down movement of the locking piece 3 in the axial direction.

[0039] Therefore, the fixed part 2 in the embodiment can be connected with the gun head 41 of the power piece 4 and can also be connected with the valve needle 90. The locking piece 3 moves up and down on the fixed part 2 and can block the opening of the second receiving space 201, and locks the valve needle 90 in the fixed part 2 after the valve needle 90 is connected with the fixed part 2, so as to facilitate the axial displacement control of the valve needle 90 through the fixed part 2. Moreover, since the locking piece 3 is a nut, it can rotate and move on the external threads of the fixed part 2, which is simple in structure, easy to manufacture and convenient to operate.

[0040] In one embodiment, the pull head 1 and the fixed part 2 in the connecting piece 10 are detachably arranged, so that before the operation step starts, the corresponding pull head 1 and the fixed part 2 can be selected according to the structure of the gun head 41 in the power piece 4 and the structure of the valve rod 91 in the valve needle 90, respectively, and the selected pull head 1 and the fixed part 2 are fixed together.

[0041] In another embodiment, if the number of selectable types of the gun head 41 of the power piece 4 or the valve rod 91 of the valve needle 90 is not large, the pull head 1 and the fixed part 2 in the connecting piece 10 can also be in a fixed connection relationship. Before the operation step starts, the adaptable connecting piece 10 can be selected according to the structure of the gun head 41 in the power piece 4 and the structure of the valve rod 91 in the valve needle 90, respectively.

[0042] Of course, the utility model also provides a hot runner system, the hot runner system includes the valve needle dismounting device 100 as described above. The hot runner system can control the opening and closing of the gate through the valve needle 90, and can also facilitate the dismounting of the valve needle 90 to facilitate the replacement or maintenance of the valve needle 90.

[0043] Therefore, as described above, in the utility model, if the valve needle 90 needs to be dismounted, the fixed part 2 in the connecting rod is connected with the valve rod 91 of the valve needle 90, then the locking piece 3 is moved to the circumferential outside of the valve rod 91 and the fixed part 2 to prevent the valve needle 90 from falling off. Then the valve needle 90 is pulled out under the action of external force. The connecting piece 10 of the valve needle dismounting device 100 and the valve rod 91 of the valve needle 90 have strong adaptability, and the locking piece 3 plays a locking role. The valve needle dismounting device 100 and the valve needle 90 are tightly connected during the dismounting of the valve needle 90, so that the valve needle 90 can be pulled out at one time, reducing the possibility of falling off and damage of the valve needle 90, and improving the work efficiency. In addition, the valve needle dismounting device 100 also includes the power piece 4, which can provide the connecting part with an axial up-down movement force, so that the valve needle 90 can also move upward along the axial direction when being pulled out, preventing the valve needle 90 from being damaged and being easily pulled out at one time. In addition, the pull head 1 and the fixed part 2 of the connecting piece 10 are respectively provided with the first containing space 101 and the second containing space 201, which can be adapted to the gun head 41 of the power piece 4 and the valve rod 91 of the valve needle 90, respectively. Therefore, during the pulling out of the valve needle 90, the power piece 4, the connecting piece 10 and the valve needle 90 are integrally moved and cannot relatively displace, further ensuring the stability of the valve needle 90 during the movement and increasing the work efficiency.

[0044] The above listed detailed descriptions are only specific descriptions for the feasible implementation manners of the present application, and they are not used to limit the protection scope of the present application. Any equivalent implementation manners or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A valve needle dismounting device for dismounting a valve needle, the valve needle comprising a needle head and a valve stem, characterized in that, The valve needle dismounting device comprises: a connecting piece comprising a pull head and a fixed part connected with each other, the fixed part being detachably connected with the valve stem; a locking piece arranged around the fixed part and movable along the axial direction of the fixed part.

2. The valve needle disassembly device according to claim 1, characterized in that The pull head is in a columnar shape, comprising a first top surface, a second top surface arranged opposite to the first top surface, and a first peripheral surface connecting the first top surface and the second top surface, the second top surface being in abutment with the fixed part.

3. The valve needle disassembly device according to claim 2, characterized in that The first top surface of the pull head is recessed inward along the axial direction thereof to form a first receiving space.

4. The valve needle dismounting device according to claim 1 or 3, characterized in that The valve needle dismounting device further comprises a power piece, the power piece being movable along the extension direction of the valve needle, the power piece comprising a gun head adapted to the pull head.

5. The valve needle removal device of claim 1, wherein The fixed part is in a columnar shape, comprising a third top surface, a fourth top surface arranged opposite to the third top surface, and a second peripheral surface connecting the third top surface and the fourth top surface, the third top surface being in abutment with the pull head.

6. The valve needle disassembly device according to claim 5, characterized in that The second peripheral surface of the fixed part is recessed inward along the radial direction thereof to the axial center thereof to form a second receiving space, the recessed shape of the second receiving space being adapted to the valve stem.

7. The valve needle disassembly device according to claim 6, characterized in that The fixed part can be divided into a first fixed layer and a second fixed layer, the second receiving space being located in the second fixed layer.

8. The valve needle disassembly device according to claim 7, characterized in that The second peripheral surface of the first fixed layer and the second fixed layer are both provided with external threads, and the inner surface of the locking piece is provided with internal threads.

9. The valve needle removal device of claim 1, wherein The pull head and the fixed part are detachably arranged or fixedly connected.

10. A hot runner system characterized by, The hot runner system comprises the valve needle dismounting device according to any one of claims 1-9.

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