Injection mold for lower shell of automobile auxiliary water tank

Abstract

The utility model relates to a lower shell injection mold of an automobile auxiliary water tank. The lower shell injection mold comprises a movable mold plate, a movable mold core embedded in the rear side of the movable mold plate, a fixed mold plate arranged behind the movable mold plate and matched with the movable mold plate, and a fixed mold core embedded in the front side of the fixed mold plate and matched with the movable mold core, a first inner core-pulling assembly is further arranged between the movable mold core and the fixed mold core, correspondingly, a first outer core-pulling assembly matched with the first inner core-pulling assembly is further arranged between the movable mold plate and the fixed mold plate, a second inner core-pulling assembly is further arranged below the first inner core-pulling assembly, and a second outer core-pulling assembly is further arranged below the first outer core-pulling assembly. A third outer core-pulling assembly and a fourth outer core-pulling assembly which are respectively distributed left and right are also arranged between the movable mold plate and the fixed mold plate; according to the utility model, the processing difficulty is greatly reduced, the manufacturing time is shortened, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to an injection mould for a lower shell of an automobile auxiliary water tank. Background Art

[0002] Automobile auxiliary water tank is an important automobile component, and its main function is to buffer the expansion of liquid when the engine temperature is high. At present, the mainstream material for producing automobile auxiliary water tank is plastic, so automobile auxiliary water tank is also produced by injection molding in an injection molding machine with the help of matching injection molds. In order to adapt to the layout in the automobile engine compartment and make rational use of the remaining space, the shape of the automobile auxiliary water tank is generally irregular. The existing injection mold can only set a corresponding number of automatic core pulling components between the movable mold plate and the fixed mold plate, so these automatic core pulling components are all around the outside of the molding cavity, and the structure located at the bottom of the molding cavity cannot be molded by the automatic core pulling component, and can only be realized by installing inserts in the mold core, but it increases the difficulty of processing the mold core, increases the manufacturing time of the mold, and also increases the manufacturing cost, which needs further improvement. Utility Model Content

[0003] In view of the current status of the above-mentioned prior art, the technical problem to be solved by the utility model is to provide an injection mold for the lower shell of an automobile auxiliary water tank which greatly reduces the processing difficulty, reduces the manufacturing time and reduces the manufacturing cost.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: an injection mold for the lower shell of an automobile auxiliary water tank, comprising a movable mold plate, a movable mold core embedded in the rear side of the movable mold plate, a fixed mold plate arranged behind the movable mold plate and cooperating with the movable mold plate, and a fixed mold core embedded in the front side of the fixed mold plate and cooperating with the movable mold core; it also includes a partition fixed to the front side of the movable mold plate, an end plate fixed to the front side of the partition plate, a pad fixed to the rear side of the fixed mold plate, and an ejection mechanism arranged between the pad and the fixed mold plate, a molding block is formed outwardly on the end surface of the fixed mold core, and correspondingly, a molding cavity cooperating with the molding block is opened on the end surface of the movable mold core, characterized in that a first inner core pulling assembly is also provided between the movable mold core and the fixed mold core, and correspondingly, a first outer core pulling assembly cooperating with the first inner core pulling assembly is also provided between the movable mold plate and the fixed mold plate, and the first inner core pulling assembly includes a movable connection on the fixed mold core The upper part comprises a first core block having a left-right translation function and located on the left side of the forming block, and a first traction rod obliquely inserted in the first core block, the front end of the first traction rod is fixed on the movable mold core; the first outer core pulling assembly comprises a second core block movably connected to the fixed mold plate to have a left-right translation function and located on the right side of the forming block, and a second traction rod obliquely inserted in the second core block, the front end of the second traction rod is fixed on the movable mold plate; a first heightening block is formed to the right on the front side of the first core block, and correspondingly, a second heightening block is formed to the left on the front side of the second core block, a first arc-shaped groove is opened on the right side of the first heightening block, and correspondingly, a second arc-shaped groove cooperating with the first arc-shaped groove is opened on the left side of the second heightening block, a positioning cavity is also opened on the right side of the first heightening block, and correspondingly, a positioning block cooperating with the positioning cavity is formed outward on the left side of the second heightening block.

[0005] Preferably, a second inner core pulling assembly is further provided below the first inner core pulling assembly, the second inner core pulling assembly comprising a third core block movably connected to the fixed mold core to have a left and right translation function and located on the right side of the forming block, and a third traction rod obliquely inserted in the third core block, the front end of the third traction rod is fixed on the movable mold core; a third heightening block is formed to the right on the front side of the third core block, and a first boss and a first contour mating surface are formed on the right side of the third heightening block, which are respectively arranged front and rear.

[0006] Preferably, a second outer core pulling assembly is further provided below the first outer core pulling assembly, the second outer core pulling assembly comprises a fourth core block movably connected to the fixed template to have a left-right translation function and located on the right side of the forming block, and a fourth traction rod obliquely inserted in the fourth core block, the front end of the fourth traction rod is fixed on the movable template; a fourth heightening block is formed on the left side of the front side of the fourth core block, and a second contour mating surface is formed on the left side of the fourth heightening block.

[0007] Preferably, an extension block is formed upward on the top of the fourth heightening block, a triangular convex block is formed outwardly on the left side of the extension block, and a second boss is formed outwardly on the left outer wall of the triangular convex block.

[0008] Preferably, a third outer core pulling assembly and a fourth outer core pulling assembly respectively distributed on the left and right are provided between the movable template and the fixed template, the third outer core pulling assembly includes a fifth core block movably connected to the fixed template to have the function of vertical movement up and down and located below the forming block, and a fifth traction rod obliquely inserted in the fifth core block, the front end of the fifth traction rod is fixed on the movable template; a fifth heightening block is formed upward on the front side of the fifth core block, a first forming notch and a second forming notch are respectively formed at the left and right corners on the front of the fifth heightening block, and a first cutting groove is also provided at the upper front corner of the fifth heightening block.

[0009] Preferably, the fourth external core pulling assembly includes a sixth core block movably connected to the fixed template to have the function of vertical movement up and down and located below the forming block, and a sixth traction rod obliquely inserted in the sixth core block, and the front end of the sixth traction rod is fixed on the movable template; a sixth heightening block is formed upward on the front side of the sixth core block, and a third contour matching surface is formed on the upper side of the sixth heightening block, and two second cutout grooves distributed on the left and right are opened at the front corner of the third contour matching surface.

[0010] Preferably, a first notch cavity and a second notch cavity are provided on the upper left inner wall of the molding cavity, and a third notch cavity and a fourth notch cavity are provided on the upper right inner wall of the molding cavity, respectively, and the third notch cavity cooperates with the first notch cavity, and the first heightening block, the third heightening block, the second heightening block and the fourth heightening block are respectively movably arranged in the first notch cavity, the second notch cavity, the third notch cavity and the fourth notch cavity.

[0011] Preferably, a fifth notch cavity and a sixth notch cavity are respectively provided on the lower inner wall of the lower part of the molding cavity, and the fifth heightening block and the sixth heightening block are respectively movably arranged in the fifth notch cavity and the sixth notch cavity.

[0012] Compared with the prior art, the advantages of the utility model are: in addition to setting the first outer core pulling assembly, the second outer core pulling assembly, the third outer core pulling assembly and the fourth outer core pulling assembly between the movable mold plate and the fixed mold plate, the utility model also sets the first inner core pulling assembly and the second inner core pulling assembly between the movable mold core and the fixed mold core, so that the water outlet, the first buckle plate and the second buckle plate and other structures located at the bottom of the molding cavity can also be molded together, and it is not necessary to install any inserts on the movable mold core or the fixed mold core, thereby greatly reducing the processing difficulty, reducing the manufacturing time and reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the exploded structural diagram of the right front side of the utility model;

[0014] Figure 2 This is the exploded structural diagram of the left rear side of the utility model;

[0015] Figure 3 It is a right front side structural diagram of the first inner core pulling assembly of the utility model;

[0016] Figure 4 It is a left rear structural diagram of the first outer core pulling assembly of the utility model;

[0017] Figure 5 It is a right front side structural diagram of the second inner core pulling assembly of the utility model;

[0018] Figure 6 It is a left rear structural diagram of the second outer core pulling assembly of the utility model;

[0019] Figure 7 It is a right front side structural diagram of the third outer core pulling assembly of the utility model;

[0020] Figure 8 It is a right front structural diagram of the fourth outer core pulling assembly of the utility model. DETAILED DESCRIPTION

[0021] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] In order to keep the following description of the embodiments of the present invention clear and concise, the present invention omits detailed descriptions of known functions and known components.

[0023] like Figures 1 to 8As shown, an injection mold for the lower shell of an automobile auxiliary water tank includes a movable mold plate 3, a movable mold core 4 embedded in the rear side of the movable mold plate 3, a fixed mold plate 5 arranged behind the movable mold plate 3 and cooperating with the movable mold plate 3, and a fixed mold core 6 embedded in the front side of the fixed mold plate 5 and cooperating with the movable mold core 4; it also includes a partition plate 2 fixed to the front side of the movable mold plate 3, an end plate 1 fixed to the front side of the partition plate 2, a pad 7 fixed to the rear side of the fixed mold plate 5, and an ejection mechanism 8 arranged between the pad 7 and the fixed mold plate 5, and the fixed mold core 6 A forming block 61 is formed outwardly on the end surface of the movable mold core 4, and correspondingly, a forming cavity 41 that cooperates with the forming block 61 is opened on the end surface of the movable mold core 4, and a first inner core pulling component 13 is also provided between the movable mold core 4 and the fixed mold core 6. Correspondingly, a first outer core pulling component 12 that cooperates with the first inner core pulling component 13 is also provided between the movable mold plate 3 and the fixed mold plate 5. The first inner core pulling component 13 includes a first core block 131 that is movably connected to the fixed mold core 6 to have a left-right translation function and is located on the left side of the forming block 61, and a tilting A first traction rod 132 is obliquely inserted in the first core block 131, and the front end of the first traction rod 132 is fixed on the movable mold core 4; the first outer core pulling assembly 12 includes a second core block 121 movably connected to the fixed mold plate 5 to have a left-right translation function and located on the right side of the forming block 61, and a second traction rod 122 is obliquely inserted in the second core block 121, and the front end of the second traction rod 122 is fixed on the movable mold plate 3; the front side of the first core block 131 is formed with a first heightening block 1311 to the right, Correspondingly, a second heightening block 1211 is formed on the left side of the front side of the second core block 121, a first arc-shaped groove 1312 is opened on the right side of the first heightening block 1311, and correspondingly, a second arc-shaped groove 1212 that cooperates with the first arc-shaped groove 1312 is opened on the left side of the second heightening block 1211, and a positioning cavity 1313 is also opened on the right side of the first heightening block 1311, and correspondingly, a positioning block 1213 that cooperates with the positioning cavity 1313 is formed outwardly on the left side of the second heightening block 1211.

[0024] A second inner core pulling assembly 14 is also provided below the first inner core pulling assembly 13. The second inner core pulling assembly 14 includes a third core block 141 movably connected to the fixed mold core 6 to have a left-right translation function and located on the right side of the forming block 61, and a third traction rod 142 obliquely inserted in the third core block 141, and the front end of the third traction rod 142 is fixed on the movable mold core 4; a third heightening block 1411 is formed to the right on the front side of the third core block 141, and a first boss 1413 and a first contour matching surface 1412 are formed on the right side of the third heightening block 1411, which are respectively arranged front and back.

[0025] A second outer core pulling assembly 11 is also provided below the first outer core pulling assembly 12. The second outer core pulling assembly 11 includes a fourth core block 111 movably connected to the fixed mold plate 5 to have a left-right translation function and located on the right side of the forming block 61, and a fourth traction rod 112 obliquely inserted in the fourth core block 111, and the front end of the fourth traction rod 112 is fixed on the movable mold plate 3; a fourth heightening block 1111 is formed on the left side of the front side of the fourth core block 111, and a second contour matching surface 1112 is formed on the left side of the fourth heightening block 1111.

[0026] An extension block 1113 is formed upward on the top of the fourth heightening block 1111 . A triangular convex block 1114 is formed outwardly on the left side of the extension block 1113 . A second boss 1115 is formed outwardly on the left outer wall of the triangular convex block 1114 .

[0027] A third outer core pulling assembly 9 and a fourth outer core pulling assembly 10 are respectively provided between the movable template 3 and the fixed template 5. The third outer core pulling assembly 9 includes a fifth core block 91 movably connected to the fixed template 5 to have the function of vertical movement up and down and located below the forming block 61, and a fifth traction rod 92 obliquely inserted in the fifth core block 91, and the front end of the fifth traction rod 92 is fixed on the movable template 3; a fifth heightening block 911 is formed upward on the front side of the fifth core block 91, and a first forming notch 913 and a second forming notch 912 are respectively formed at the left and right corners on the front of the fifth heightening block 911, and a first cutting groove 914 is also provided at the upper front corner of the fifth heightening block 911.

[0028] The fourth external core pulling assembly 10 includes a sixth core block 101 which is movably connected to the fixed template 5 so as to have the function of vertical movement up and down and is located below the forming block 61, and a sixth traction rod 102 which is obliquely inserted in the sixth core block 101, and the front end of the sixth traction rod 102 is fixed on the movable template 3; a sixth heightening block 1011 is formed upward on the front side of the sixth core block 101, and a third contour matching surface 1012 is formed on the upper side of the sixth heightening block 1011, and two second cutout grooves 1013 distributed on the left and right are opened at the front corner of the third contour matching surface 1012.

[0029] A first notch cavity 42 and a second notch cavity 44 are provided on the upper left inner wall of the molding cavity 41, and a third notch cavity 43 and a fourth notch cavity 45 are provided on the upper right inner wall of the molding cavity 41, respectively. The third notch cavity 43 cooperates with the first notch cavity 42, and the first heightening block 1311, the third heightening block 1411, the second heightening block 1211 and the fourth heightening block 1111 are respectively movably arranged in the first notch cavity 42, the second notch cavity 44, the third notch cavity 43 and the fourth notch cavity 45.

[0030] A fifth notch cavity 46 and a sixth notch cavity 47 are respectively provided on the inner wall of the lower part of the molding cavity 41 , and the fifth heightening block 911 and the sixth heightening block 1011 are respectively movably disposed in the fifth notch cavity 46 and the sixth notch cavity 47 .

[0031] Working principle:

[0032] The end plate 1 and the pad 7 are respectively installed on the action mechanism and the body of the injection molding machine, and the end plate 1 is driven to move backward by the action mechanism, and then the movable mold plate 3 is driven to move toward the direction of the fixed mold plate 5 by the partition plate 2 until the two are assembled with each other, so that the movable mold core 4 and the fixed mold core 6 fit each other (existing technology), and the molding block 61 at this time extends into the molding cavity 41; in the process of the movable mold plate 3 moving backward, it will drive the second traction rod 122 in the first outer core pulling assembly 12, the fourth traction rod 112 in the second outer core pulling assembly 11, the fifth traction rod 92 in the third outer core pulling assembly 9, and the sixth traction rod 102 in the fourth outer core pulling assembly 10 to move backward, and then with the cooperation of the second traction rod 122 and the second core block 121, The mutual cooperation between the fourth traction rod 112 and the fourth core block 111, the mutual cooperation between the fifth traction rod 92 and the fifth core block 91, and the mutual cooperation between the sixth traction rod 102 and the sixth core block 101 drive the second core block 121 and the fourth core block 111 to move to the left, and at the same time drive the fifth core block 91 and the sixth core block 101 to move upward, so that the left side of the second heightening block 1211 on the second core block 121, the second contour matching surface 1112 on the fourth heightening block 1111, the first molding notch 913 and the second molding notch 912 on the fifth heightening block 911, and the third contour matching surface 1012 on the sixth heightening block 1011 all extend into the interior of the molding cavity 41 and cooperate with the corresponding side outer walls of the molding block 61.

[0033] When the movable mold core 4 moves backward following the movable mold plate 3, it will drive the first traction rod 132 in the first inner core pulling assembly 13 and the third traction rod 142 in the second inner core pulling assembly 14 to move backward, and then with the help of the mutual cooperation between the first traction rod 132 and the first core block 131 and the mutual cooperation between the third traction rod 142 and the third core block 141, the first core block 131 and the third core block 141 are driven to move to the right, so that the first arc-shaped groove 1312 on the first heightening block 1311 extends into the interior of the molding cavity 41 and is located in front of the molding block 61. At this time, the second arc-shaped groove 1212 located on the second heightening block 1211 also extends into the interior of the molding cavity 41 and is located in front of the molding block 61 and is spliced ​​with the first arc-shaped groove 1312.

[0034] Afterwards, the molten material enters the area between the molding cavity 41 and the molding block 61 through the gate provided in the end plate 1 and the runner provided in the partition 2, and the auxiliary water tank lower shell 15 is formed after cooling (prior art); then, the end plate 1 is driven to move forward by means of the action mechanism, and then the movable mold plate 3 is driven to move in the direction away from the fixed mold plate 5 by means of the partition 2, so that the movable mold core 4 leaves the fixed mold core 6, and then the molded auxiliary water tank lower shell 15 is ejected forward by means of the ejection mechanism 8 (prior art).

[0035] The first arc-shaped groove 1312 cooperates with the second arc-shaped groove 1212 to form a water outlet 151 on the auxiliary water tank lower shell 15; the right side of the third heightening block 1411 on the third core block 141 cooperates with the right inner wall of the molding cavity 41 to form a first buckle piece 152 on the auxiliary water tank lower shell 15, and the first boss 1413 forms a first hanging hole 153 on the first buckle piece 152; the triangular boss 1114 on the extension block 1113 forms a second buckle piece 154 on the auxiliary water tank lower shell 15, and the second boss 1115 forms a second hanging hole 155 on the second buckle piece 154.

[0036] In addition to setting the first outer core pulling assembly 12, the second outer core pulling assembly 11, the third outer core pulling assembly 9 and the fourth outer core pulling assembly 10 between the movable mold plate 3 and the fixed mold plate 5, the utility model also sets the first inner core pulling assembly 13 and the second inner core pulling assembly 14 between the movable mold core 4 and the fixed mold core 6, so that the structures such as the water outlet 151, the first buckle piece 152 and the second buckle piece 154 located at the bottom of the molding cavity 41 can also be molded together, and it is not necessary to install any inserts on the movable mold core 4 or the fixed mold core 6, thereby greatly reducing the processing difficulty, reducing the manufacturing time and reducing the manufacturing cost.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An injection mold for the lower shell of an automobile auxiliary water tank, comprising a movable mold plate, a movable mold core embedded in the rear side of the movable mold plate, a fixed mold plate arranged behind the movable mold plate and cooperating with the movable mold plate, and a fixed mold core embedded in the front side of the fixed mold plate and cooperating with the movable mold core; further comprising a partition plate fixed on the front side of the movable mold plate, an end plate fixed on the front side of the partition plate, a pad fixed on the rear side of the fixed mold plate, and an ejection mechanism arranged between the pad and the fixed mold plate, a molding block is formed outwardly on the end surface of the fixed mold core, and correspondingly, a molding cavity cooperating with the molding block is opened on the end surface of the movable mold core, characterized in that A first inner core-pulling assembly is also provided between the movable mold core and the fixed mold core, and correspondingly, a first outer core-pulling assembly cooperating with the first inner core-pulling assembly is also provided between the movable mold plate and the fixed mold plate, wherein the first inner core-pulling assembly includes a first core block movably connected to the fixed mold core to have a left-right translation function and located on the left side of the forming block, and a first traction rod obliquely inserted in the first core block, wherein the front end of the first traction rod is fixed on the movable mold core; the first outer core-pulling assembly includes a second core block movably connected to the fixed mold plate to have a left-right translation function and located on the right side of the forming block, and A second traction rod is obliquely inserted in the second core block, and the front end of the second traction rod is fixed on the dynamic template; a first heightening block is formed to the right on the front side of the first core block, and correspondingly, a second heightening block is formed to the left on the front side of the second core block, a first arc-shaped groove is opened on the right side of the first heightening block, and correspondingly, a second arc-shaped groove cooperating with the first arc-shaped groove is opened on the left side of the second heightening block, a positioning cavity is also opened on the right side of the first heightening block, and correspondingly, a positioning block cooperating with the positioning cavity is formed outward on the left side of the second heightening block.

2. The lower shell injection mold of the automobile auxiliary water tank according to claim 1, characterized in that: A second inner core pulling assembly is also provided below the first inner core pulling assembly, and the second inner core pulling assembly includes a third core block movably connected to the fixed mold core to have a left and right translation function and located on the right side of the forming block, and a third traction rod obliquely inserted in the third core block, and the front end of the third traction rod is fixed on the movable mold core; a third heightening block is formed to the right on the front side of the third core block, and a first boss and a first contour matching surface are formed on the right side of the third heightening block respectively arranged front and back.

3. The lower shell injection mold of the automobile auxiliary water tank according to claim 2, characterized in that: A second outer core pulling assembly is also provided below the first outer core pulling assembly, and the second outer core pulling assembly includes a fourth core block movably connected to the fixed template to have a left and right translation function and located on the right side of the forming block, and a fourth traction rod obliquely inserted in the fourth core block, and the front end of the fourth traction rod is fixed on the movable template; a fourth heightening block is formed on the left side of the front side of the fourth core block, and a second contour matching surface is formed on the left side of the fourth heightening block.

4. The lower shell injection mold of the automobile auxiliary water tank according to claim 3, characterized in that: An extension block is also formed upward on the top of the fourth heightening block, a triangular convex block is formed outward on the left side of the extension block, and a second boss is formed outward on the left outer wall of the triangular convex block.

5. The lower shell injection mold of the automobile auxiliary water tank according to claim 4, characterized in that: A third outer core pulling assembly and a fourth outer core pulling assembly are respectively provided between the movable template and the fixed template, and are distributed on the left and right sides respectively. The third outer core pulling assembly includes a fifth core block movably connected to the fixed template to have the function of vertical movement up and down and located below the forming block, and a fifth traction rod obliquely inserted in the fifth core block, and the front end of the fifth traction rod is fixed on the movable template; a fifth heightening block is formed upward on the front side of the fifth core block, and a first forming notch and a second forming notch are respectively formed at the left and right corners on the front of the fifth heightening block, and a first cutting groove is also provided at the upper front corner of the fifth heightening block.

6. The lower shell injection mold of the automobile auxiliary water tank according to claim 5, characterized in that: The fourth outer core pulling assembly includes a sixth core block movably connected to the fixed template to have the function of vertical movement up and down and located below the forming block, and a sixth traction rod obliquely inserted in the sixth core block, and the front end of the sixth traction rod is fixed on the movable template; a sixth heightening block is formed upward on the front side of the sixth core block, and a third contour matching surface is formed on the upper side of the sixth heightening block, and two second cutout grooves distributed on the left and right are provided at the front corner of the third contour matching surface.

7. The lower shell injection mold of the automobile auxiliary water tank according to claim 6, characterized in that: A first notch cavity and a second notch cavity are respectively distributed up and down on the upper left inner wall of the molding cavity, and a third notch cavity and a fourth notch cavity are respectively distributed up and down on the upper right inner wall of the molding cavity. The third notch cavity cooperates with the first notch cavity, and the first heightening block, the third heightening block, the second heightening block and the fourth heightening block are respectively movably arranged in the first notch cavity, the second notch cavity, the third notch cavity and the fourth notch cavity.

8. The lower shell injection mold of the automobile auxiliary water tank according to claim 7, characterized in that: A fifth cavity and a sixth cavity are respectively arranged on the inner wall of the lower part of the molding cavity, and the fifth heightening block and the sixth heightening block are respectively movably arranged in the fifth cavity and the sixth cavity.

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