TWI656960B - Hot runner anti-temperature loss structure - Google Patents

Abstract

The present invention includes at least one set of heat flow plate devices equipped with heating elements, a set of heat conducting bodies disposed at the heat flow plate device, a guide tube received in the cavity of the heat conducting body, and a screwing body at the heat conducting body a locking member, a cold template located in front of the heat flow plate device, a heat blocking unit interposed between the heat conducting body and the cold template, and a set of the heat sealing plate disposed at the cold template a heat insulating sleeve at the outer side of the shaft portion of the body, wherein the heat conducting body is axially provided with a through hole, and the other end of the shaft hole communicates with a receiving groove, and a thread is formed on the inner wall of the other end of the receiving groove For the screwing of the locking member, and the guiding cylinder is clamped between the receiving groove of the heat conducting body and the locking member; further, the shaft portion of the heat conducting body sequentially passes through the shaft After the heat-resisting unit and the cavity of the cold template, the shaft portion of the heat-conducting body is received into a hole of the heat-insulating sleeve that has been disposed at the limiting recess of the cold template, so that the The heat blocking unit is located between the heat conducting body and the cold template.

Description

 Hot runner anti-temperature loss structure  

The present invention relates to a hot runner construction; in particular, to a temperature loss prevention structure without a heating coil type hot runner, and the heat blocking unit is mounted between the heat conducting body and the cold template to achieve thermal barrier Conducting and reducing the thermal insulation effect of thermal conduction heat loss, so that the temperature at the outlet of the guide cylinder can be maintained within the required operating temperature range.

According to the conventional hot runner structure, as shown in FIGS. 1 to 2, the hot runner 9 is housed inside the cavity 980 of the female mold 98, and the hot runner 9 includes a set of a heat conducting body 90 at a template (not shown), a heating coil 91 disposed outside the heat conducting body 90, and a guiding cylinder 92 received in the cavity 902 of the heat conducting body 90, The heat-conducting body 90 is provided with a locking member 93, wherein the heat-conducting body 90 is provided with an axially extending shaft hole 901, and a receiving groove 902 is formed at the other end of the shaft hole 901, and is disposed in the receiving groove 902. A thread 903 is formed in the wall, so that the threaded portion 930 of the locking member 93 can be directly screwed to the thread 903, so that the seat portion 920 of the guiding cylinder 92 is sandwiched between the heat conducting body 90. The bottom edge of the groove 902 is between the locking member 93, and the shaft portion 921 of the guiding cylinder 92 can be inserted into the axial hole 933 of the locking member 93, and the cone tip of the guiding cylinder 92 is made. The portion 922 can protrude beyond the surrounding portion 932 of the locking member 93 such that the surrounding portion 932 can make contact with the inner wall surface of the cavity 980 of the female mold 98, thereby making the shaft of the guiding cylinder 92 The hole 923 can surely form a communication with the shaft hole 901 of the heat conducting body 90 (as shown in FIG. 1); at this time, the heating of the machine equipment (not shown) causes the hot melted plastic 99 to be squeezed into the body. The shaft hole 901 of the heat-conducting body 90 flows through the shaft hole 923 of the guide cylinder 92 and is directly injected into the prototype hole 975 which is formed between the male and female molds 97 and 98 (e.g. Fig. 1), at the same time, will be reversely squeezed into the surrounding portion 932 filled with the locking member 93 and the conical tip portion 922 of the guiding cylinder 92 and the inner wall surface of the cavity 980 of the female mold 98. In the formed space region A (because the conical tip portion 922 of the guide cylinder 92 and the inner wall surface of the cavity 980 of the female die 98 are formed with an open suitable distance instead of a closed state in which the contact is completely blocked); The machine will cut off the heating coil 91, and the cooling system that has been installed inside the master mold 98, after waiting for a few minutes, can use the inner wall surface of the cavity 980 of the female mold 98 and the The surrounding portion 932 of the locking member 93 forms a contact, so that the inner wall surface of the cavity 980 of the lower temperature female mold 98 can directly absorb the higher temperature. The heat value or thermal energy of the surrounding portion 932 of the locking member 93 can also directly absorb the heat value or thermal energy of the hot melt plastic 99 already located in the embryonic blast 975 so that it is located in the embryonic blast 975. The hot melted plastic 99 and the hot melted plastic 99 already located in the space area A are cooled and solidified. Finally, after the molds of the male and female molds 97 and 98 are opened, the cured plastic can be taken out. (ie, the initial embryo), at the same time, the solidified plastic 99 that has been filled in the space area A can be blocked at the axial hole 923 in the tapered end portion 922 of the guide cylinder 92 (as shown in Fig. 2), and is prevented. The hot melted plastic 99 then oozes out from the shaft hole 923; however, after a period of time, in order to reproduce the blast, the machine must restart the heating coil 91 to start heating, and at the same time, make the mother The supply cold water system in the mold 98 stops operating so that the heating coil 91 can be continuously heated to a temperature higher than the operating temperature (about 100 to 300 ° C) before the heating value or temperature generated by the heating coil 91 can pass through the heat conducting body 90. Conducted sequentially to the guide barrel 92, the locking member 93 and the female mold 98, Until the solidified plastic 99 which has been located in the space area A and the solidified plastic 99 which has been located in the axial hole 923 of the tapered end 922 of the guide cylinder 92 are simultaneously softened into a hot melt state, the injection can be re-injected and filled again. Located in the embryonic burrow 975 formed between the male and female molds 97 and 98 (as shown in Figure 1), the purpose of continuous or intermittent production can be achieved; although the above-mentioned creation can achieve the original purpose of creation, Appreciated by the industry and the general operators, but in view of the industry's continuous innovation and breakthrough in research and development and technology, so that applicants work harder to study and improve, so that it is perfect and practical; plus, The creators have responded with numerous updates to the experimental tests and the actual use of the consumers, and found that the following problems still need to be further improved: due to discontinuous shots in fractional or segmental (ie intermittent), due to The plastic 99 that has been located in the space area A and the plastic 99 that has been located at the axial hole 923 inside the tapered tip portion 922 of the guide cylinder 92 are cooled for a longer period of time to lower the surface temperature and The ground will make the surface harder. Therefore, when the heating coil 91 is restarted to start heating, it must be heated from the surface temperature of the cured plastic 99 to the upper limit of the working temperature, so that the heating temperature range becomes larger, and Relatively, it will make the time required for preheating longer. At the same time, the power consumption required to reach the working temperature again is relatively large, so as to increase the cost of electricity, and thus fail to achieve the effect of energy saving is a major problem.

Therefore, how to develop a heating time and heating temperature range required to shorten the working temperature again, and to save electricity costs is a major task for the industry.

In view of this, the inventors have actively developed research, and in order to improve the lack of the hot runner structure described above, the inventors have been working on the manufacture of such products for many years, and after long-term efforts and experiments, finally developed and designed this. The invented hot runner anti-wracking structure can benefit all consumers and manufacturers.

The main content of the hot runner anti-milk structure of the present invention is to provide a heat flow plate device that is assembled with the heating element by using the heat conductive body, and the shaft portion of the heat conductive body can pass through the heat resistance step by step. After the unit and the cavity of the cold template, the heat blocking unit is clamped between the heat conducting body and the cold template, and the shaft portion of the heat conducting body can be accommodated into the assembled a hole in the heat insulating sleeve of the cold template; and the heat blocking function of the heat blocking unit prevents the shaft portion of the heat conducting body from directly contacting the cold template, and The base hole disposed at the receiving portion of the locking member disposed at the heat conducting body can only form direct contact with the socket portion of the guiding tube, and the spacing hole of the receiving portion and the guiding tube Maintaining an appropriate distance between the extensions so that the outlet of the guide cylinder can be maintained within the operating temperature range, and the plastic surface in the outlet of the guide cylinder is not solidified due to temperature loss, and at the same time, Shorten the heating required to reach the operating temperature range again And between the heating temperature range, to significantly reduce the cost of electricity consumed, so as to achieve energy-saving effect of which the carbon of progressive claims.

For the purpose of the above creation, the main technical means of the hot runner anti-collapse structure of the present invention comprises at least one set of heat flow plate devices equipped with heating elements and a set of heat conductive bodies disposed at the heat flow plate devices. a guide cylinder disposed in the cavity of the heat-conducting body, a locking member screwed to the heat-conducting body, a cold template located at the front of the heat-flowing device, and a sandwiching portion disposed on the heat-conducting body a heat-insulating unit between the cold template, and a plurality of heat-insulating sleeves disposed at the cold template and disposed outside the shaft portion of the heat-conducting body, wherein: the heating element device is provided with a heating element And having an outlet end for shunting on the end surface; the heat conducting body is a base and a shaft portion extending upward from the base; and the heat conducting body is axially provided with a through hole, and The shaft end is connected with a receiving groove at the other end, and a thread is formed on the inner wall of the other end of the receiving groove for screwing the locking member, and the seat portion of the guiding tube can be clamped to the heat conducting body. Between the receiving groove and the locking member; the guiding cylinder has a consistent a space portion between the upper and lower end faces, a seat portion received in the cavity, and a sleeve portion that is in contact with the lock member; the lock member is screwed to the heat conductive body a threaded portion at the thread, a pulling portion located above the threaded portion, a surrounding portion located above the pulling portion, and a set of axially extending portions disposed at a sleeve portion of the guiding barrel The cold template is located in front of the heat flow plate device, and includes a mold cavity disposed at a shaft portion of the heat conductive body, and a positioning concave portion for the heat dissipation unit to be placed. a limiting recess for setting the heat insulating sleeve set, a flow passage for circulating a cooling liquid; the insulating sleeve is a base portion and a socket portion extending vertically upward from the base portion a through hole formed from a top end of the socket portion to a bottom end of the base portion, and a positioning hole for piercing the bolt.

1‧‧‧Hot flow plate device

10‧‧‧ heating elements

11‧‧‧export end

17‧‧‧Male mold

18‧‧‧Female mold

19‧‧‧Forming cavity

2‧‧‧thermal body

20‧‧‧ Pedestal

21‧‧‧ shaft section

23‧‧‧Axis hole

24‧‧‧ 容容

241‧‧‧ thread

3‧‧‧ cold template

30‧‧‧ cavity

31‧‧‧ Positioning recess

32‧‧‧Limited recess

320‧‧‧Threaded holes

33‧‧‧Runner

4‧‧‧Guide tube

40‧‧‧s

41‧‧‧ Sockets

42‧‧‧Extension

45‧‧‧Space Zone

5‧‧‧Locks

50‧‧‧Threading Department

51‧‧‧Turning Department

52‧‧‧Encircling

53‧‧‧ 容部

531‧‧‧Kecon

532‧‧‧ spaced holes

6‧‧‧Insulation sleeve

60‧‧‧ base

601‧‧‧Positioning holes

61‧‧‧ 承套部

610‧‧‧ hole

65‧‧‧ bolt

7‧‧‧Resistance unit

8‧‧‧ plastic

9‧‧‧ finished product

A‧‧‧Export

Figure 1 is a combined cross-sectional view of a conventional hot runner structure.

Fig. 2 is a combined sectional view after the operation of Fig. 1.

Figure 3 is a perspective exploded view of the present invention.

Fig. 4 is a perspective assembled view of the assembly of Fig. 3 when applied.

Figure 5 is a schematic cross-sectional view of the fourth figure applied to the male and female molds.

The present invention relates to a hot runner anti-milk structure, as shown in Figures 3 to 5, which includes at least one set of heat flow plate means 1 with heating elements 10, a set of contacts to the heat flow The heat-conducting body 2 at the plate device 1 and the guide tube 4 housed in the cavity 24 of the heat-conducting body 2, a locking member 5 screwed to the heat-conducting body 2, and a heat flow plate device 1 a cold template 3 at the front, a heat blocking unit 7 disposed between the heat conducting body 2 and the cold template 3, and a set of shaft portions 21 disposed at the cold template 3 and sleeved on the heat conducting body 2 The heat-insulating sleeve 6 at the outer side, wherein: the heat flow plate device 1 is provided with a heating element 10 therein, and an outlet end 11 for shunting is provided at an end surface thereof; the heat-conducting body 2 is made of a metal material The assembly is in contact with the heat flow plate device 1 and includes at least a base 20, a shaft portion 21 extending upward from the base 20, a shaft hole 23 extending axially through the shaft portion 21, and a connection a groove 24 leading to the other end of the shaft hole 23, and a thread 241 disposed at the inner wall of the other end of the groove 24, utilizing the thread of the lock member 5 50 is directly screwed to the thread 241, and the seat 40 of the guide cylinder 4 is sandwiched between the cavity 24 of the heat-conducting body 2 and the lock member 5 (as shown in Fig. 5); The shaft portion 21 of the heat-conducting body 2 sequentially passes through the heat-blocking unit 7 and the cavity 30 of the cold template 3, so that the heat-blocking unit 7 can be clamped between the heat-conducting body 2 and the cold template 3. And the above-mentioned shaft portion 21 is accommodated into the hole 610 of the heat insulating sleeve 6 which is disposed at the limiting recess 32 of the cold template 3, so that the heat insulating sleeve is The inner wall surface of the hole 610 of the hole 6 does not directly contact the outer surface of the shaft portion 21 of the heat-conducting body 2, but the inner wall surface of the hole 610 of the heat-insulating sleeve 6 can only be used with the lock in a small area. The outer surface of the component 5 is in direct contact with each other; and the heat-insulating unit 7 is preferably formed in a layered shape or a hollow through hole therebetween, and the thermal conductivity of the heat-blocking unit 7 must be less than 10 W/mk. in particular, the resistance to thermal unit 7 based steatite (Mgo SiO _2), or zirconium oxide ceramic (ZrO ₂₎ is optimal; the cold plate 3, located in front of the heat plate based apparatus 1, the system comprising a cavity 30 disposed at the shaft portion 21 of the heat-conducting body 2, a positioning recess 31 for the heat-dissipating unit 7 to be placed, and a limiting recess 32 for setting the heat-insulated housing 6 And a flow passage 33 for circulating a cooling liquid; the guide cylinder 4 is made of a metal material, and includes a space portion 45 extending through the two upper and lower end faces, a seat portion 40 received in the cavity 24, a sleeve portion 41 that is inserted into the base hole 531 of the lock member 5, and an extension portion 42 that is smaller in size than the sleeve portion 41, wherein the extension portion 42 is interposed between the extension portion 42 and the sleeve portion 41. It is in the shape of a class, or the extension portion 42 is tapered (that is, convergently bundled from one end of the socket portion 41 toward the top end surface of the guide cylinder 4), so that the sleeve 4 is sleeved. The portion 41 can be inserted into the base hole 531 of the accommodating portion 53 of the locking member 5, and only the inner wall surface of the accommodating portion 41 and the accommodating portion 53 of the locking member 5 can be That is, the inner wall surface of the base hole 531 is in direct contact with each other, and the extension portion 42 does not directly contact the other inner wall surface of the receiving portion 53 of the lock member 5 (ie, the inner wall surface of the spacer hole 532). Lower the guide 4, a direct contact area with the locking member 5; the locking member 5 is made of a metal material, and includes a threaded portion 50 screwed to the thread 241 of the heat conducting body 2, and a threaded portion 50 above the threaded portion 50. a clamping portion 51, a surrounding portion 52 located above the pulling portion 51, and a sleeve-shaped receiving portion 53 disposed at the sleeve portion 41 of the guiding cylinder 4; The portion 53 is formed by the base hole 531 of the lower half and the spacer hole 532 of the upper half, and the spacer hole 532 is formed in a tapered hole shape which is enlarged upward, or the diameter of the spacer hole 532 is larger than the base hole 531. The diameter of the base member 531 is such that the base hole 531 of the accommodating portion 53 is in direct contact with the sleeve portion 41 of the guide cylinder 4, and the spacing hole 532 of the accommodating portion 53 is aligned with the guide tube 4 is kept at an appropriate distance (not in contact); the heat insulating sleeve 6 is made of a metal material, and includes a base portion 60, a socket portion 61 extending vertically from the base portion 60, and a top portion of the socket portion 61. An axially penetrating bore 610 formed through the bottom end of the base 60 and a positioning hole 601 for the bolt 65 to penetrate therein, wherein the bolt 65 is used to pass through The positioning hole 601 of the heat insulating sleeve 6 is directly screwed to the threaded hole 320 of the cold template 3 so that the heat insulating sleeve 6 can be tightly fixed to the cold template 3, and the heat insulating sleeve is The inner wall surface of the hole 610 of the seat 6 does not directly contact the outer surface of the shaft portion 21 of the heat-conducting body 2, but the inner wall surface of the hole 610 of the heat-insulating sleeve 6 is arranged in a small area manner. The outer surface of the surrounding portion 52 of the locking member 5 disposed at the shaft portion 21 maintains a slight contact between the outer surfaces; when used, the male and female molds 17 are first used by means of equipment (not shown). And 18 are moved toward each other to be in a closed state, and then the heated molten semi-cured plastic 8 is pushed by the pressing force of the machine to be squeezed into the shaft hole 23 of the heat-conducting body 2, and then continues to be squeezed. The pressure flows through the space region 45 of the guide cylinder 4, at this time, since the base 20 of the heat-conducting body 2 is in contact with the heat flow plate device 1 in which the heating element 10 is assembled, and the heating element 10 continues to be added Under warm start, the heat of the heating element 10 is sequentially transmitted to the heat conducting body via the metal heat flow plate device 1 2 shaft portion 21, the metal guide tube 4 and the metal locking member 5, so that the plastic 8 flowing through the heat conducting body 2 and the guiding tube 4 will not have a temperature loss and retain The relative fluidity is finally injected into the molding cavity 19 composed of the male and female molds 17, 18 which are filled to the cooling shape via the space region 45 of the guide cylinder 4 toward the outlet A (e.g. Fig. 5); at this time, due to the water pipes of cold water or ice water embedded in the male and female molds 17, 18, the surface of the metal male and female molds 17, 18 will be ice-cold, so that they have been squeezed. The plastic 8 in the molding cavity 19 formed between the male and female molds 17 and 18 will start to cool from the surface until it is completely solidified to form a hollow primordial embryo. Finally, the hollow primordial embryo can be opened. At this time, if the same primordial embryo is to be produced again, it only needs to be produced in the same step. At this time, since the susceptor 20 of the heat-conducting body 2 is in contact with the heat flow plate device 1 in which the heating element 10 is assembled. And the heat insulating cover 6 is locked to the limiting recess 32 of the cold template 3, although the heat conducting body 2 is not directly insulated from the heat insulating body 2 The seat 6 is in direct contact, but the surrounding portion 52 of the locking member 5 that has been assembled at the heat conducting body 2 is in direct contact with the inner wall surface of the hole 610 of the heat insulating sleeve 6 in a micro area. In addition, the heat-resisting unit 7 is clamped between the heat-conducting body 2 and the cold template 3, so that the heat-resistant body 2 in a high temperature state and the cold template 3 in a low temperature state are caused by the heat resistance. The thermal conductivity of the unit 7 is less than 10 W/mk and naturally forms a barrier or thermal insulation that is not easily circulated or has extremely poor heat transfer efficiency; therefore, the heat value or temperature generated by the heating element 10 having a higher temperature is caused. 250 to 300 ° C) will be sequentially transferred from the heat flow plate device 1 to the heat-conducting body 2, the guide barrel 4 (including its outlet A) and the lock member 5, while the cold template is lower in temperature. 3, the heat value or temperature of the surrounding portion 52 from the locking member 5 is contacted by the inner wall surface of the hole 610 of the heat insulating sleeve 6 in a small area so that the surrounding portion 52 of the locking member 5 is 52. The temperature will be slightly lower than the temperature at the threaded portion 50 or the pulling portion 51 (the contact area is relatively small, and the temperature is lost. The speed is also relatively slow); in addition, although the base hole 531 at the receiving portion 53 of the locking member 5 can only make direct contact with the socket portion 41 of the guiding cylinder 4, the locking member The spacing hole 532 at the accommodating portion 53 of the 5 is kept at an appropriate distance (ie, not in contact) with the extending portion 42 of the guiding cylinder 4, so that the thermal conductivity thereof is relatively small due to the smaller contact area thereof, in other words, The heat-conducting body 2 having a higher temperature is conducted to the extension portion 42 of the guide cylinder 4, and the temperature at the extension portion 42 of the guide cylinder 4 is slightly deteriorated due to some loss or loss of heat energy during heat conduction. The temperature of the heat-conducting body 2 is slightly lower than that of the heat-conducting body 2, but the heat-melting semi-curing in the space region 45 (ie, the front end of the guide cylinder 4) at the extension portion 42 or the outlet A of the guide cylinder 4 The plastic 8 is also maintained in the same operating temperature range by heat conduction, so that the hot melted semi-cured plastic 8 already located in the space 45 of the guide cylinder 4 remains in a hot melt state without The injected hot-melt plastic 8 forms a temperature-free solidification phenomenon, and can be surely shortened to reach the operating temperature range again. The heating time required and the desired heating temperature range, to significantly reduce the cost of electricity consumption, and thus achieve the effect of saving energy and carbon.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; therefore, the features and spirits described in the scope of the present application are equally varied or modified. Within the scope of the patent application of the present invention.

Claims (8)

A hot runner anti-winding structure includes at least one set of heat flow plate devices equipped with heating elements, a set of heat conducting bodies disposed at the heat flow plate device, and a cavity accommodated in the heat conducting body a guiding cylinder, a locking member screwed to the heat conducting body, a cold template located in front of the heat flow device, a heat blocking unit sandwiching the heat conducting body and the cold template, and a set of And a heat insulating sleeve device disposed at an outer side of the shaft portion of the heat conducting body, wherein: the heat flow plate device is provided with a heating element therein, and an outlet end for shunting is provided at an end surface thereof The heat-conducting body is composed of a base and a shaft portion extending upward from the base. Further, the heat-conducting body is axially provided with a through-shaft hole, and the other end of the shaft hole communicates with a receiving groove. And forming a thread on the inner wall of the other end of the receiving groove for screwing the locking member, and clamping the seat portion of the guiding cylinder between the receiving groove of the heat conducting body and the locking member The guiding cylinder has a space region extending through the two upper and lower end faces, and a receiving portion a seat portion in the slot, and a sleeve portion that is in contact with the lock member; the lock member has a threaded portion screwed to the thread of the heat conductive body, and a threaded portion above the threaded portion a clamping portion, a surrounding portion located above the pulling portion, and an axially-shaped receiving portion disposed at the socket portion of the guiding cylinder; the cold template is located in the heat flow plate device The front side includes a set of cavities disposed at the shaft portion of the heat conducting body, a positioning recess for the heat blocking unit to be placed, and a limit for setting the heat insulating seat set a recess, a flow passage for circulating a cooling liquid; the heat blocking unit is sleeved on the shaft portion of the heat conducting body, and the heat blocking unit can be adjacent to one side of the base, thereby causing the The heat blocking unit can be sandwiched between the heat conducting body and the cold template; The heat insulation sleeve is composed of a base portion, a socket portion extending vertically upward from the base portion, a penetrating hole formed from a top end of the socket portion to a bottom end of the base portion, and a bolt a positioning hole for penetrating; after the shaft portion of the heat conducting body sequentially passes through the heat blocking unit and the cavity of the cold template, the heat blocking unit is clamped between the heat conducting body and the cold template Between the high-temperature heat-conducting body and the low-temperature cold template, a barrier or heat insulation effect that is not easy to flow or has poor heat conduction efficiency is naturally formed, and the shaft portion is placed therein to be assembled. In the hole of the heat insulating sleeve of the cold template, the heat blocking effect of the heat blocking unit can further slow down the cooling speed at the outlet of the guiding tube, and can ensure the outlet of the guiding tube The location will remain within the operating temperature range, and there will be no solidification at the outlet of the guide cylinder. The hot runner anti-temperature loss structure according to claim 1, wherein the thermal conductivity of the thermal insulation unit must be less than 10 W/m.k. The hot runner anti-temperature loss structure according to claim 2, wherein the heat blocking unit is talc porcelain. The hot runner anti-winding structure according to claim 2, wherein the heat blocking unit is a zirconia ceramic. The hot runner anti-collapse structure according to the first, second, third or fourth aspect of the invention, wherein the heat-blocking unit is disposed at a positioning recess of the cold template. The hot runner anti-winding structure according to the fifth aspect of the invention, wherein the bolt is directly screwed to the threaded hole of the cold template after passing through the positioning hole of the heat insulating sleeve, so that the The insulating sleeve can be tightly fixed to the limiting recess of the cold template. The hot runner anti-winding structure according to claim 6, wherein the guide cylinder is provided with an extension smaller than the sleeve portion, and the extension portion and the sleeve portion are in a class Forming such that the extension portion maintains a certain distance from the inner wall surface of the receiving portion of the lock member without direct contact, and has a direct contact area and heat conduction between the guide tube and the lock member. rate.    The hot runner anti-winding structure according to claim 6, wherein the guide cylinder is provided with an extension smaller than the sleeve portion, and the extension portion is tapered (ie, self-socketing) One end of the portion is tapered toward the top end surface of the guide tube so as to maintain a certain distance between the extending portion and the inner wall surface of the receiving portion of the locking member without direct contact, and the lowering of the portion The direct contact area and thermal conductivity between the guide barrel and the lock member.