In-mold product fixation mechanism for a mold

Abstract

The application provides a product in-mold fixing mechanism of a mold, and belongs to the technical field of molds. The product in-mold fixing mechanism of the mold solves the problem of unstable positioning of products in the mold in the prior art. The product in-mold fixing mechanism of the mold comprises a front mold, the front mold is provided with a cavity surface for forming a product surface, a plurality of pressing blocks in sliding connection with the front mold are arranged at the edge of the cavity surface, a plurality of jacks corresponding to the pressing blocks are arranged on the front mold, the product in-mold fixing mechanism further comprises a floating plate capable of driving the jacks to move upward synchronously, the jacks can drive the corresponding pressing blocks to move horizontally toward the cavity surface when moving upward, a plurality of pressing blocks include at least two horizontal pressing blocks capable of being horizontally pressed against the edge of the product through horizontal movement and at least one vertical pressing block capable of pressing the edge of the product downward through horizontal movement. On the basis of effectively protecting the product, the product with smooth edges can be stably fixed in the mold.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of molds and relates to a product in-mold fixing mechanism of a mold. BACKGROUND

[0002] In a multi-station inverted mold such as a multi-color vehicle lamp cover mold and a thick-wall light guide layered injection mold, an in-mold fixing mechanism is usually needed to fix the first-color injection-molded product in the mold, so as to prevent the product from loosening and falling off when the mold is opened and the movable mold side is rotated for position switching.

[0003] At present, the product in-mold fixing mode of the mold is as follows: a patent document, a secondary forming inverted rotary double-color mold (application number: 202120054433.0), the mold comprises a front mold, a rear mold and a fixing mechanism, the fixing mechanism is arranged outside a first forming cavity and a second forming cavity, the fixing mechanism comprises an oil cylinder and a fixing plate, the oil cylinder is arranged on the front mold, a piston rod of the oil cylinder is provided with the fixing plate, and the fixing plate is expanded and contracted with the piston rod of the oil cylinder. When the first color is injection molded, the oil cylinder drives the fixing plate to move close to the injection cavity to clamp the edge of the product, so as to realize the positioning of the product. However, the following problems exist in the actual production process of the device: 1. The device fixes the product by using a plurality of fixing plates. For some conventional products, the fixing plates can have a good fixing effect. However, when the device is used to fix some specific products such as vehicle lamp covers, it is difficult to fix the vehicle lamp cover because the long edge of the vehicle lamp cover is a smooth edge without a rib position and a flange. If the fixing plate is pressed on the edge of the vehicle lamp cover with a large pressure, the edge of the vehicle lamp cover will be deformed and worn. If the pressure is reduced, the stability of the fixing of the vehicle lamp cover will be affected. 2. Because the injection-molded product is a plastic part, the displacement stroke and position accuracy of each fixing plate need to be accurately controlled when the product is positioned by clamping the edge of the product by using the fixing plate. This requires each oil cylinder to have high running stability and running accuracy. However, because the device uses a plurality of oil cylinders to realize the positioning of the product, a relatively complex oil circuit system needs to be arranged. The more complex the oil circuit system is, the more difficult it is to maintain and the more likely it is to cause an increase in the failure rate. This is not conducive to the stable operation of each oil cylinder. At the same time, the oil cylinder is sensitive to the surrounding environment and temperature. During the long-term operation of the equipment, the oil cylinder itself may have some problems such as oil leakage and wear. It is difficult to ensure that so many oil cylinders can operate stably with high accuracy during the long-term operation of the equipment. In the actual manufacturing process, the running accuracy of one or more oil cylinders may decrease, which may cause the product to be positioned unstably, affect the quality of the product during secondary injection molding, or cause the fixing plate to hit the edge of the product, which may result in the product being worn, deformed or even damaged. SUMMARY

[0004] The product in-mold fixing mechanism of the mold aims at the above problems existing in the prior art, and solves the technical problem of how to stably fix the product with smooth edges in the mold on the basis of effectively protecting the product.

[0005] The product in-mold fixing mechanism of the mold aims at the above problems existing in the prior art, and solves the technical problem of how to stably fix the product with smooth edges in the mold on the basis of effectively protecting the product.

[0006] The product in-mold fixing mechanism of the mold aims at the above problems existing in the prior art, and solves the technical problem of how to stably fix the product with smooth edges in the mold on the basis of effectively protecting the product.

[0007] The product in-mold fixing mechanism of the mold aims at the above problems existing in the prior art, and solves the technical problem of how to stably fix the product with smooth edges in the mold on the basis of effectively protecting the product.

[0008] In addition, each pressing block in the mechanism is connected to the floating plate through a jack, so that the floating plate and each pressing block are linked, and when designing and maintaining, only the stroke accuracy of the floating plate needs to be adjusted, so that each pressing block can smoothly and accurately translate, thereby facilitating the accurate action of each pressing block on the product and stably fixing the product. Moreover, only one driving member is needed as a driving structure to drive the floating plate to move upward, which can simplify the driving structure, facilitate maintenance, and reduce the failure rate, so that the floating plate can stably drive each pressing block to translate and further stably fix the product.

[0009] In the product in-mold fixing mechanism of the mold, the plurality of pressing blocks further includes a buckle pressing block, the buckle pressing block has a protruding extension, and the extension has a stepped gap on the end face facing the cavity surface. The vehicle lamp cover has a buckle for mounting on the vehicle, and the stepped gap of the buckle pressing block can be engaged with the buckle on the vehicle lamp cover, thereby further improving the fixing effect of the vehicle lamp cover.

[0010] In the product in-mold fixing mechanism of the mold, the number of the horizontal pressing blocks is 3-6, the number of the vertical pressing blocks is one, the vertical pressing block and the buckle pressing block are located on one side of the cavity surface, and each horizontal pressing block is located on the other side of the cavity surface and is sequentially and spacedly arranged along the edge of the cavity surface. Preferably, the number of the horizontal pressing blocks is 3. The vertical pressing block and the buckle pressing block are located on one side of the cavity surface, so that the vertical pressing block and the buckle pressing block correspond to the product flange and the buckle, thereby stably fixing the product. Each horizontal pressing block is sequentially and spacedly arranged along the edge of the cavity surface, so that the plurality of horizontal pressing blocks are positioned at different positions of the smooth edge of the product, thereby improving the positioning effect, and the plurality of horizontal pressing blocks form force dispersion, so that the smooth edge of the product is not deformed or worn, thereby protecting the product.

[0011] In the product in-mold fixing mechanism of the mold, the front mold includes a mold frame and a mold core arranged in the mold frame, and the cavity surface is located on the mold core. The floating plate is horizontally arranged below the mold core. The lower end of the jack is fixedly connected with the floating plate, so that the floating plate can drive the jack to synchronously move up and down. This structure has the advantages of compact structure and easy manufacturing.

[0012] In the product mold fixing mechanism of the mold, the lower end of the ejector rod is fixedly connected with the floating plate, a plurality of guide columns are arranged on the mold frame and pass through the floating plate and form a guide cooperation with the floating plate, and a driving member capable of driving the floating plate to move up and down is arranged on the mold frame. By arranging the guide columns, the stability and position accuracy of the floating plate during movement are improved. As a preferred embodiment, the driving member is an oil cylinder, and a pneumatic cylinder, an electric cylinder or a screw motor can also be used.

[0013] In the product mold fixing mechanism of the mold, the ejector rod is vertically slidably arranged on the front mold, a T-shaped sliding groove is arranged on the side wall of the upper end of the ejector rod, the T-shaped sliding groove is gradually inclined towards the cavity surface from top to bottom, and a sliding part in sliding connection with the T-shaped sliding groove is arranged on the pressing block. The ejector rod is vertically slidably arranged on the front mold, thereby ensuring the stability of the ejector rod during movement. Since the T-shaped sliding groove is gradually inclined towards the cavity surface from top to bottom, when the ejector rod moves upwards, the pressing block can be driven to translate towards the cavity surface, thereby fixing the product. Conversely, when the ejector rod moves downwards, the pressing block can be driven to translate away from the cavity surface, thereby releasing the product.

[0014] In the product mold fixing mechanism of the mold, a plurality of pressing block guide grooves are arranged on the mold core, the pressing blocks are arranged in the pressing block guide grooves one by one, and the pressing block guide grooves can guide the translation of the pressing blocks. Through such a design, the stability of the movement of the pressing blocks is better, and the position accuracy is higher, so that the pressing blocks can accurately act on the product, thereby stably positioning the product and avoiding wear or deformation of the product.

[0015] In the product mold fixing mechanism of the mold, the pressing block guide groove comprises a bottom wall, two oppositely arranged guide walls and a front side wall connected between the two guide walls and perpendicular to the bottom wall, and the bottom wall and the two guide walls abut against the outer wall of the pressing block and form a sliding cooperation. The design makes the top of the pressing block guide groove form an open structure, which facilitates the installation of the pressing block. Moreover, the two guide walls and the bottom wall of the pressing block guide groove abut against the outer wall of the pressing block and form a sliding cooperation, so that the pressing block guide groove and the pressing block have a large guide area, thereby improving the guide effect and ensuring that the pressing block can stably and accurately translate.

[0016] In the product mold fixing mechanism of the mold, a spring mounting hole is arranged on the outer wall of the front side wall of the pressing block, and a spring abutting against the front side wall is arranged in the spring mounting hole. When the ejector rod moves downwards, the spring can assist the pressing block to translate away from the cavity surface, so as to more smoothly release the product.

[0017] In the product mold fixing mechanism of the mold, the two guide walls of the pressing block guide groove are respectively fixedly connected with limiting plates, the two side walls opposite to the guide walls of the pressing block are respectively provided with stepped surfaces, and the stepped surfaces abut against the bottom surfaces of the corresponding limiting plates. The limiting plates can press the stepped surfaces on the pressing block downward, so that the pressing block cannot move upward and can only translate. In addition, the limiting plates and the stepped surfaces form a sliding fit, and the limiting plates are respectively located on the two sides of the pressing block, so that the pressing block is uniformly pressed by the two limiting plates, and the stability of the translation process of the pressing block can be improved.

[0018] Compared with the prior art, the product mold fixing mechanism of the mold has the following advantages:

[0019] 1. The product mold fixing mechanism realizes the in-mold fixing of the product through the cooperation of the vertical pressing block, the buckle pressing block and the horizontal pressing blocks, effectively ensures the stability of the product positioning, prevents the product from loosening during rotation and position change, prevents the smooth edge of the product from being deformed or worn, thereby protecting the product and improving the forming quality of the product.

[0020] 2. Each pressing block in the mechanism is connected to the floating plate through a jack, so that the floating plate and each pressing block are linked, and only one driving member is needed to drive each pressing plate to translate. Therefore, the mechanism not only achieves the purpose of simplifying the structure, but also has the advantages of easy maintenance, low failure rate and low manufacturing cost.

[0021] 3. Each pressing block is driven by one driving member to move synchronously, so that the action rhythm of the mold can be shortened and the production efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic view of the three-dimensional structure of the product mold fixing mechanism (without showing the product).

[0023] Figure 2 is a schematic view of the three-dimensional structure of the product mold fixing mechanism hidden behind the mold frame (showing the product).

[0024] Figure 3 is a schematic view of the cooperation structure of each pressing block and the product (dashed line part).

[0025] Figure 4 is Figure 3 is an enlarged view of A in

[0026] Figure 5 is Figure 4 is a rotational cross-sectional view of A-A in

[0027] Figure 6 is Figure 3 is an enlarged view of B in

[0028] Figure 7 is a sectional view of the vertical pressing block at the product abutting position.

[0029] Figure 8 is Figure 3 is an enlarged view of C in

[0030] Figure 9 is a schematic view of the fitting structure of the buckle pressing block and the product (dashed part).

[0031] Figure 10 is a schematic view of the three-dimensional structure of the buckle pressing block.

[0032] Figure 11 is a top view of the in-mold fixing mechanism of the product (schematically showing the product).

[0033] Figure 12 is Figure 11 is a sectional view of A-A.

[0034] Figure 13 is Figure 12 is an enlarged view of A.

[0035] Figure 14 is an exploded view of the horizontal pressing block and the ejector rod.

[0036] Figure 15 is a partial enlarged view of the in-mold fixing mechanism of the product.

[0037] Figure 16 is a schematic view of the three-dimensional structure of the mold core.

[0038] In the figure, 1 is the product; 1a is the buckle; 2 is the front mold; 21 is the mold core; 211 is the cavity surface; 22 is the mold frame; 3 is the pressing block; 31 is the horizontal pressing block; 311 is the bar-shaped groove; 32 is the vertical pressing block; 33 is the buckle pressing block; 331 is the extension; 332 is the stepped gap; 4 is the ejector rod; 41 is the T-shaped sliding groove; 5 is the floating plate; 6 is the guide column; 7 is the driving member; 8 is the pressing block guide groove; 81 is the bottom wall; 82 is the guide wall; 83 is the front side wall; 9 is the sliding part; 10 is the spring mounting hole; 11 is the spring; 12 is the limiting plate; and 13 is the stepped surface. DETAILED DESCRIPTION

[0039] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the accompanying drawings, but the present application is not limited to these embodiments.

[0040] Example One

[0041] The in-mold fixing mechanism of this product is mainly used in multi-color rotary molding dies to fix the first-color injection-molded headlight cover within the mold. Of course, in the actual manufacturing process, this mechanism can also be used for in-mold fixing of products other than headlight covers by changing the shape of the cavity surface 211.

[0042] like Figure 1 and Figure 2 As shown, Figure 1 Product 1 is not shown on the medium-sized cavity surface 211, but... Figure 2 The diagram illustrates Product 1 (car headlight cover). In the in-mold fixing mechanism of this mold, the mold includes a front mold 2 with a cavity surface 211. The front mold 2 includes a mold frame 22 and a mold core 21 disposed within the mold frame 22. The cavity surface 211 is located on the mold core 21. The in-mold fixing mechanism includes five pressure blocks 3 slidably disposed on the front mold 2 and located at the edge of the cavity surface 211. The front mold 2 is provided with five ejector rods 4 that are connected one-to-one with the pressure blocks 3. The front mold 2 is also provided with a floating plate 5 that can drive each ejector rod 4 to move upward synchronously. The floating plate 5 is horizontally disposed below the mold core 21. When the ejector rods 4 move upward, they can drive the corresponding pressure blocks 3 to move laterally toward the cavity surface 211.

[0043] like Figure 2 As shown, the five pressure blocks 3 include three transverse pressure blocks 31 that can be translated to abut against the product edge laterally, one vertical pressure block 32 that can be translated to press down on the product edge, and one snap-fit ​​pressure block 33. The vertical pressure block 32 and the snap-fit ​​pressure block 33 are located on one side of the cavity surface 211, and each transverse pressure block 31 is located on the other side of the cavity surface 211 and is arranged alternately along the edge of the cavity surface 211. Of course, in the actual manufacturing process, the number of transverse pressure blocks 31, vertical pressure blocks 32, and snap-fit ​​pressure blocks 33 can be appropriately changed according to the product size. For example, there can be 4, 5, or 6 transverse pressure blocks 31, and the number of vertical pressure blocks 32 and snap-fit ​​pressure blocks 33 can be two.

[0044] like Figure 4 and Figure 5 As shown, the transverse pressure block 31 has a strip groove 311 that abuts against the smooth edge of the product 1. The cross-section of the strip groove 311 is an arc shape that matches the edge of the product 1. This design can improve the stability of the transverse pressure block 21 against the product 1, thereby improving the fixing effect of the product 1.

[0045] like Figure 6 and Figure 7 As shown, the edge of product 1 (car headlight cover) has a flange, and after the vertical pressing block 32 is translated toward the cavity surface 211, the vertical pressing block 32 can press down on the flange on the edge of product 1, so that product 1 can be well positioned and will not loosen or fall off.

[0046] As shown in Figure 8 to Figure 10 The buckle pressing block 33 has a protruding extension 331, and the extension 331 has a stepped gap 332 on the end face of the cavity face 211. By setting the buckle pressing block 33, the stepped gap of the buckle pressing block 33 can be engaged with the buckle 1a on the product 1 (the car lamp cover), thereby further improving the fixing effect of the product 1.

[0047] As shown in Figure 11 and Figure 12 The ejector rod 4 is vertically slid along the front mold 2, and the lower end of the ejector rod 4 is fixedly connected with the floating plate 5. The mold frame 22 is provided with a plurality of guide columns 6 that pass through the floating plate 5 and form a guide fit with the floating plate 5. The mold frame 22 is also provided with a driving member 7 that can drive the floating plate 5 to move up and down. By setting the guide column 6, the stability and position accuracy of the floating plate 5 during movement are improved. In this embodiment, the driving member 7 is an oil cylinder.

[0048] As shown in Figure 13 and Figure 14 The side wall of the upper end of the ejector rod 4 is provided with a T-shaped sliding groove 41 that gradually inclines from top to bottom towards the cavity face 211. The horizontal pressing block 31, the vertical pressing block 32, and the buckle pressing block 33 are all provided with a sliding part 9 that is in sliding connection with the T-shaped sliding groove 41. When the ejector rod 4 moves upward, it can drive the pressing block 3 to translate towards the cavity face 211, thereby fixing the product 1. Conversely, when the ejector rod 4 moves downward, it can drive the pressing block 3 to translate away from the cavity face 211, thereby releasing the product 1.

[0049] As shown in Figure 15 and Figure 16 The mold core 21 is also provided with a plurality of pressing block guide grooves 8, and the pressing block 3 is correspondingly arranged in the pressing block guide groove 8, and the pressing block guide groove 8 can guide the translation of the pressing block 3. Through such design, the stability of the movement of the pressing block 3 is better, and the position accuracy is higher. Specifically, the pressing block guide groove 8 includes a bottom wall 81, two oppositely arranged guide walls 82, and a front side wall 83 connected between the two guide walls 82 and perpendicular to the bottom wall 81. The bottom wall 81 and the two guide walls 82 are in abutment with the outer wall of the pressing block 3 and form a sliding fit. The two guide walls 82 of the pressing block guide groove 8 are respectively fixedly connected with a limiting plate 12, and the two side walls opposite to the guide walls 82 of the pressing block 3 are respectively provided with a stepped surface 13, and the stepped surface 13 abuts against the bottom surface of the corresponding limiting plate 12. The limiting plate 12 can press down the stepped surface 13 on the pressing block 3, so that the pressing block 3 cannot move upward but can only translate. In combination with Figure 12 and Figure 13As shown, the spring mounting hole 10 is formed on the outer wall of the front side wall 83 of the pressing block 3, and the spring 11 is arranged in the spring mounting hole 10 and abuts against the front side wall 83. When the ejector rod 4 moves downward, the spring 11 can assist the pressing block 3 to move away from the cavity surface 211, so as to more smoothly release the product 1. Figure 12 to Figure 15 The installation mode and the connection mode with the ejector rod 4 of the transverse pressing block 31 are illustrated, and the installation mode and the connection mode with the ejector rod 4 of the vertical pressing block 32 and the buckle pressing block 33 are similar to those of the transverse pressing block 31, and thus the drawing is not illustrated in detail.

[0050] When the product in-mold fixing mechanism is installed, the product in-mold fixing mechanism can be horizontally arranged on the vertical injection molding machine as shown in Figure 1 Fig. 1, and the mold opening direction is the vertical direction. Of course, the product in-mold fixing mechanism can also be vertically arranged on the horizontal injection molding machine according to the actual situation, and the mold opening direction is the horizontal direction.

[0051] In the specific work, before the mold is closed, the driving member 7 drives the floating plate 5 and the ejector rod 4 to move upward, drives the pressing block 3 to move forward to the position, and then the mold is closed to realize the injection molding of the first color product. After the injection molding is completed, the mold is rotated by 180° to change the position, and the pressing block 3 remains stationary, so as to ensure that the pressing block 3 presses the product 1 and avoids the product 1 from being loosened and displaced. Then, the mold is closed again to realize the second color injection molding of the product 1. After the injection, pressure maintaining and cooling of the product 1 are completed, the driving member 7 drives the floating plate 5 to move downward, the pressing block 3 is withdrawn, the mold is opened, and finally the product 1 is ejected by the ejection system including the ejector block and the ejector rod 4. Then, the driving member 7 drives the floating plate 5 to move upward again, the pressing block 3 moves forward to the position to reset, the mold is closed, and the next product production cycle is started. In addition, the product in-mold fixing mechanism can also be applied to the mold with three colors (rotated by 120°), four colors (rotated by 90°) and other multi-station molds.

[0052] Embodiment Two

[0053] The embodiment is basically the same as the structure and principle of the embodiment one, and the difference is that the driving member 7 is a pneumatic cylinder.

[0054] The specific embodiments described in the present text are only illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0055] Although this document frequently uses terms such as 1. product; 1a. snap-fit; 2. front mold; 21. mold core; 211. cavity surface; 22. mold frame; 3. pressure block; 31. transverse pressure block; 32. vertical pressure block; 33. snap-fit ​​pressure block; 331. extension; 332. stepped notch; 4. ejector pin; 41. T-shaped slide; 5. floating plate; 6. guide post; 7. driving component; 8. pressure block guide groove; 81. bottom wall; 82. guide wall; 83. front side wall; 9. sliding part; 10. spring mounting hole; 11. spring; 12. limiting plate; 13. stepped surface, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A product in-mold fixing mechanism of a mold, comprising a front mold (2) having a cavity surface (211) for forming a surface of a product (1) on the front mold (2), and a plurality of pressing blocks (3) slidably connected to the front mold (2) at the edge of the cavity surface (211), characterized in that, The front mold (2) is provided with a plurality of ejector rods (4) corresponding to the pressing blocks (3), the product mold fixing mechanism further comprises a floating plate (5) capable of driving the ejector rods (4) to move upward synchronously, the ejector rods (4) can drive the corresponding pressing blocks (3) to move horizontally towards the cavity surface (211) when moving upward, the plurality of pressing blocks (3) comprises at least two horizontal pressing blocks (31) capable of horizontally abutting on the product edge by horizontal translation, and at least one vertical pressing block (32) capable of pressing the product edge downward by horizontal translation, and the plurality of pressing blocks (3) further comprises a buckle pressing block (33), the buckle pressing block (33) has a protruding extension (331), and the extension (331) has a stepped gap (332) on the end face facing the cavity surface (211).

2. The in-mold securement of products of a mold according to claim 1, characterized in that, The number of the horizontal pressing blocks (31) is 3-6, the number of the vertical pressing block (32) is one, the vertical pressing block (32) and the buckle pressing block (33) are located on one side of the cavity surface (211), and each horizontal pressing block (31) is located on the other side of the cavity surface (211) and is sequentially and spacedly arranged along the edge of the cavity surface (211).

3. The in-mold securement of product for a mold of claim 1 or 2, wherein, The front mold (2) comprises a mold frame (22) and a mold core (21) arranged in the mold frame (22), and the cavity surface (211) is located on the mold core (21), and the floating plate (5) is horizontally arranged below the mold core (21).

4. The in-mold securement of products of a mold according to claim 3, wherein, The lower end of the ejector rod (4) is fixedly connected with the floating plate (5), the mold frame (22) is provided with a plurality of guide columns (6) penetrating through the floating plate (5) and forming a guide fit with the floating plate (5), and a driving member (7) capable of driving the floating plate (5) to move up and down is further arranged on the mold frame (22).

5. The in-mold securement of products of a mold according to claim 1 or 2, characterized in that, The ejector rod (4) slides vertically through the front mold (2), a T-shaped sliding groove (41) is formed in the side wall of the upper end of the ejector rod (4), the T-shaped sliding groove (41) gradually inclines towards the cavity surface (211) from top to bottom, and the pressing block (3) is provided with a sliding part (9) in sliding connection with the T-shaped sliding groove (41).

6. The in-mold securement of products of a mold according to claim 3, wherein, A plurality of pressing block guide grooves (8) are further formed in the mold core (21), the pressing block (3) is arranged in the pressing block guide groove (8) in one-to-one correspondence, and the pressing block guide groove (8) can guide the translation of the pressing block (3).

7. The in-mold securement mechanism of claim 6, wherein, The pressing block guide groove (8) comprises a bottom wall (81), two oppositely arranged guide walls (82), and a front side wall (83) connected between the two guide walls (82) and perpendicular to the bottom wall (81), and the bottom wall (81) and the two guide walls (82) are in abutment with the outer wall of the pressing block (3) and form a sliding fit.

8. The in-mold securement mechanism of claim 7, wherein, The outer wall of the pressing block (3) facing the front side wall (83) is provided with a spring mounting hole (10), and the spring mounting hole (10) is provided with a spring (11) abutting against the front side wall (83).

9. The in-mold securement mechanism of claim 7, wherein, The two guide walls (82) of the briquet guide slot (8) are respectively fixedly connected with limiting plates (12), the two side walls of the briquet (3) opposite to the guide walls (82) are respectively provided with stepped surfaces (13), and the stepped surfaces (13) abut against the bottom surfaces of the corresponding limiting plates (12).

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