Mold testing device

Abstract

The utility model relates to a mold testing device which comprises a shell, a transmission shaft, a first sliding block, a second sliding block, two supporting blocks and a connecting assembly. A mounting opening is formed in the peripheral side of the shell; the transmission shaft is located in the shell and rotationally connected with the shell, the transmission shaft is provided with a first thread and a second thread, and the second thread is opposite to the first thread; the first sliding block is connected with the transmission shaft through a first thread; the second sliding block is connected with the transmission shaft through a second thread; the two supporting blocks are located on the two sides of the shell correspondingly. The connecting assembly comprises two connecting ribs, the connecting ribs are movably connected with the first sliding blocks, and the connecting ribs can rotate and slide relative to the first sliding blocks; the connecting rib is movably connected with the second sliding block and can rotate and slide relative to the second sliding block; the connecting rib is movably connected with the two supporting blocks, and the end of the connecting rib can rotate and slide relative to the supporting blocks. The distance between the supporting blocks can be adjusted, the requirements of different environments can be met, and the product cost and the management cost are reduced.

Description

Technical Field

[0001] This application relates to the field of interbody fusion devices, and in particular to a trial molding device. Background Technology

[0002] Background of Trial Molding Device Use: Posterior lumbar fusion surgery is currently a relatively mature surgical method for treating lumbar disc herniation, lumbar spinal stenosis, and lumbar spondylolisthesis. During the surgery, an interbody fusion cage of appropriate size and depth needs to be implanted to achieve interbody fusion. Choosing an interbody fusion cage of appropriate size and depth can avoid the risk of bony endplate rupture due to an oversized cage, and also avoid the risk of cage displacement due to an undersized cage. Therefore, trial molding devices of different sizes are needed to determine the size and depth of the fusion cage before implantation.

[0003] Existing trial molding machines are all of fixed size, with one specification corresponding to one type of trial molding machine. To meet the needs of different environments, hospitals usually prepare a set (several or even more) of tools, resulting in high product and management costs. Utility Model Content

[0004] Based on this, a molding tester is provided, which can adjust the distance between the support blocks to meet the needs of different environments, eliminating the need for hospitals to prepare multiple tools and reducing product and management costs.

[0005] To address this, this application provides a molding apparatus, comprising: a housing having an inner cavity, and an installation opening on the periphery of the housing; a drive shaft located within the housing and rotatably connected to the housing, the drive shaft having a first thread and a second thread spaced apart on its periphery at the installation opening, the second thread being opposite to the first thread; a first slider located at the installation opening, the first slider being connected to the drive shaft via the first thread; a second slider located at the installation opening, the second slider being connected to the drive shaft via the second thread; two support blocks located on opposite sides of the housing; and a connecting assembly comprising two intersecting connecting ribs, the connecting ribs being movably connected to the first slider and rotatable and slidable relative to the first slider; the connecting ribs being movably connected to the second slider and rotatable and slidable relative to the second slider; the opposite ends of the connecting ribs being movably connected to the two support blocks, the ends of the connecting ribs being rotatable and slidable relative to the support blocks.

[0006] In one embodiment, the first slider is provided with a first guide post, and the connecting rib is provided with a first sliding groove, wherein the first guide post can rotate and slide in the first sliding groove; and / or, the second slider is provided with a second guide post, and the connecting rib is provided with a second sliding groove, wherein the second guide post can rotate and slide in the second sliding groove.

[0007] In one embodiment, two third guide posts are respectively provided at both ends of the connecting rib, and the support block is provided with a third sliding groove, in which the third guide posts can rotate and slide.

[0008] In one embodiment, a mounting column is provided at the intersection of the two connecting ribs, and the connecting ribs are rotatably connected to the mounting column.

[0009] In one embodiment, the support block is provided with a relief groove for installing the connecting rib.

[0010] In one embodiment, the support block is curved on the side opposite to the connecting component.

[0011] In one embodiment, an adjusting member is also connected to the end of the drive shaft. The adjusting member has a first ridge on its periphery, and there are multiple first ridges that are spaced apart around the periphery of the adjusting member.

[0012] In one embodiment, the adjustment member is further provided with a scale on its periphery.

[0013] In one embodiment, the periphery of the housing is provided with a second ridge, and multiple second ridges are provided, which are spaced apart around the periphery of the housing. The end of the housing facing the adjusting member is also provided with a handle. The handle has an inner cavity, which is divided into a first chamber and a second chamber. The first chamber is fitted with the housing, and the inner wall of the first chamber is provided with a first engaging ridge that engages with the first ridge to prevent the handle from rotating relative to the housing. The second chamber is used to fit the adjusting member, and the inner wall of the second chamber is provided with a second engaging ridge that engages with the second ridge to prevent the handle from rotating relative to the adjusting member.

[0014] In one embodiment, a rotary bearing is provided between the drive shaft and the housing.

[0015] The mold-making apparatus provided according to the embodiments of this application includes a housing, a drive shaft, a first slider, a second slider, two support blocks, and a connecting assembly. The housing has an inner cavity, and an installation port is provided on the periphery of the housing. The drive shaft is located inside the housing and is rotatably connected to the housing. A first thread and a second thread are provided at intervals on the periphery of the drive shaft at the installation port, with the second thread being opposite to the first thread. The first slider is located at the installation port and is connected to the drive shaft via the first thread. The second slider is located at the installation port and is connected to the drive shaft via the second thread. The two support blocks are located on opposite sides of the housing. The connecting assembly includes two intersecting connecting ribs. The connecting ribs are movably connected to the first slider and can rotate and slide relative to the first slider. The connecting ribs are also movably connected to the second slider and can rotate and slide relative to the second slider. The opposite ends of the connecting ribs are movably connected to the two support blocks, and the ends of the connecting ribs can rotate and slide relative to the support blocks. During operation, the molding apparatus of this application enters the working area through the endoscope channel or other channels. Based on requirements, a suitable size is selected. Specifically, the movement between the first and second sliders is controlled by rotating the drive shaft, thereby controlling the opening angle of the two connecting ribs, which in turn controls the distance between the two support blocks, thus adjusting the appropriate size of the molding apparatus. The dimensions of this application are adjustable, eliminating the need for a set (or several or more) of tools, thereby reducing product and management costs. Attached Figure Description

[0016] Figure 1 This illustration shows a structural schematic diagram of a molding apparatus provided in an embodiment of this application;

[0017] Figure 2 This illustration shows a structural diagram of a housing and handle provided in an embodiment of this application;

[0018] Figure 3 This illustration shows a partial structural diagram of a molding apparatus provided in an embodiment of this application;

[0019] Figure 4 This diagram illustrates a structural schematic of a support block and connecting assembly provided in an embodiment of this application.

[0020] Figure 5 This image shows a cross-sectional view of a handle provided in an embodiment of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Housing; 11. Mounting port; 12. Second ridge; 2. Drive shaft; 3. First slider; 31. First guide post; 4. Second slider; 41. Second guide post; 5. Support block; 51. Third slide groove; 52. Clearance groove; 6. Connecting assembly; 61. Connecting rib; 611. First slide groove; 612. Second slide groove; 613. Third guide post; 7. Mounting post; 8. Adjusting component; 81. First ridge; 9. Handle; 91. First chamber; 92. Second chamber; 10. Bearing. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0025] The structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0026] The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "middle," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification are based on the orientations or positional relationships shown in the accompanying drawings and are only for the purpose of simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Existing trial molding machines are all of fixed size, with one specification corresponding to one type of trial molding machine. To meet the needs of different environments, hospitals usually prepare a set (several or even more) of tools, which results in high costs and management costs.

[0028] To solve the above problems, refer to Figure 1 and Figure 2 , Figure 1 This diagram illustrates the structure of a molding apparatus according to an embodiment of this application. Figure 2 This diagram illustrates the structure of a housing and handle provided in an embodiment of this application.

[0029] This application provides a molding apparatus, including a housing 1, a drive shaft 2, a first slider 3, a second slider 4, two support blocks 5, and a connecting assembly 6. The housing 1 has an inner cavity, and an installation port 11 is opened on the periphery of the housing 1. The drive shaft 2 is located inside the housing 1 and is rotatably connected to the housing 1. The drive shaft 2 has a first thread (not shown in the figure) and a second thread (not shown in the figure) spaced apart on the periphery of the installation port 11. The second thread is opposite to the first thread. The first slider 3 is located at the installation port 11 and is connected to the drive shaft 2 by the first thread. The second slider 4 is located at the installation port 11 and is connected to the drive shaft by the second thread. The two support blocks 5 are located on both sides of the housing 1. The connecting assembly 6 includes two intersecting connecting ribs 61. The connecting ribs 61 are movably connected to the first slider 3 and can rotate and slide relative to the first slider 3. The connecting ribs 61 are also movably connected to the second slider 4 and can rotate and slide relative to the second slider 4. The opposite ends of the connecting ribs 61 are movably connected to the two support blocks 5, and the ends of the connecting ribs 61 can rotate and slide relative to the support blocks 5.

[0030] It should be understood that the housing 1 is cylindrical, and can be a square, round, or other shaped tube; this application does not impose any limitations. Therefore, the housing 1 has an internal cavity, and one end of the housing 1 can be closed to prevent foreign objects from entering the housing 1 and reduce the impact on the parts inside. A mounting port 11 is also provided on the periphery of the housing 1, penetrating the side wall of the housing 1, allowing the housing 1 to communicate with the outside.

[0031] The drive shaft 2 is cylindrical with one end extending into the housing 1 and the other end extending out of the housing 1 for easy operation. The drive shaft 2 can rotate within the housing 1. The drive shaft 2 has a first thread and a second thread at the mounting port 11. The first thread and the second thread are spaced apart along the length of the drive shaft 2, and the first thread and the second thread are opposite in direction.

[0032] The first slider 3 is located in the inner cavity of the housing 1. The first slider 3 is slidably connected to the housing 1, that is, the first slider 3 can move along the length direction of the housing 1. The first slider 3 is threadedly connected to the transmission shaft 2 through the first thread. When the transmission shaft 2 rotates relative to the housing 1, the first slider 3 moves along the length direction of the housing 1.

[0033] The second slider 4 is located in the inner cavity of the housing 1. The second slider 4 is slidably connected to the housing 1, that is, the second slider 4 can move along the length direction of the housing 1. The second slider 4 is threadedly connected to the transmission shaft 2 through the second thread. When the transmission shaft 2 rotates relative to the housing 1, the second slider 4 moves along the length direction of the housing 1.

[0034] Since the first thread and the second thread are set oppositely, the first slider 3 and the second slider 4 move in opposite directions. In one example, the first slider 3 and the second slider 4 move closer to each other, and in another example, the first slider 3 and the second slider 4 move further apart.

[0035] Two support blocks 5 are provided, located on opposite sides of the housing 1. The connecting assembly 6 includes two intersecting connecting ribs 61. The connecting ribs 61 are movably connected to the first slider 3, and can rotate and move simultaneously relative to the first slider 3. The connecting ribs 61 are also movably connected to the second slider 4, and can rotate and move simultaneously relative to the second slider 4. Both ends of the connecting ribs 61 along their length are movably connected to the two support blocks 5, and can rotate and move simultaneously relative to the support blocks 5.

[0036] When the first slider 3 and the second slider 4 approach each other, the opening angle of the two connecting ribs 61 increases, thereby increasing the distance between the two support blocks 5; when the first slider 3 and the second slider 4 move away from each other, the opening angle of the two connecting ribs 61 decreases, thereby decreasing the distance between the two support blocks 5.

[0037] During operation, the mold-testing device of this application enters the working area through the endoscope channel or other channels. Based on requirements, a suitable size is selected. Specifically, the movement between the first slider 3 and the second slider 4 is controlled by rotating the transmission shaft 2, thereby controlling the opening angle of the two connecting ribs 61, which in turn controls the distance between the two support blocks 5, thus adjusting the appropriate size of the mold-testing device. The size of this application is adjustable, eliminating the need for a set (or several or even more) of tools, thereby reducing product and management costs.

[0038] Reference Figures 1-4 , Figure 3 This diagram shows a partial structural schematic of a molding apparatus provided in an embodiment of this application. Figure 4 This diagram illustrates a structural schematic of a support block and connecting assembly provided in an embodiment of this application.

[0039] In some optional embodiments, the first slider 3 is provided with a first guide post 31, and the connecting rib 61 is provided with a first sliding groove 611. The first guide post 31 can rotate and slide in the first sliding groove 611. The first guide post 31 is connected to the first slider 3, and the connection method can be a fixed connection or a detachable connection, which is not limited in this application. In one example, the first guide post 31 and the first slider 3 are made of the same material, and the first guide post 31 and the first slider 3 are integrally formed. The first guide post 31 is located at the mounting opening 11, and the first guide post 31 is cylindrical, thereby facilitating the rotation and sliding of the first guide post 31 in the first sliding groove 611. The first sliding groove 611 is located at the connecting rib 61 and corresponds to the first guide post 31. The first sliding groove 611 extends along the length direction of the connecting rib 61, and the end of the first sliding groove 611 is arc-shaped, further improving the smoothness of the movement of the first guide post 31 in the first sliding groove 611.

[0040] Furthermore, since there are two connecting ribs 61, there are also two corresponding first guide posts 31.

[0041] In some optional embodiments, the second slider 4 is provided with a second guide post 41, and the connecting rib 61 is provided with a second sliding groove 612. The second guide post 41 can rotate and slide in the second sliding groove 612. The second guide post 41 is connected to the second slider 4, and the connection method can be a fixed connection or a detachable connection, which is not limited in this application. In one example, the second guide post 41 and the second slider 4 are made of the same material, and the second guide post 41 and the second slider 4 are integrally formed. The second guide post 41 is located at the mounting opening 11, and the second guide post 41 is cylindrical, thereby facilitating the rotation and sliding of the second guide post 41 in the second sliding groove 612. The second sliding groove 612 is located at the connecting rib 61 and corresponds to the second guide post 41. The second sliding groove 612 extends along the length direction of the connecting rib 61, and the end of the second sliding groove 612 is arc-shaped, further improving the smoothness of the movement of the second guide post 41 in the second sliding groove 612.

[0042] Furthermore, since there are two connecting ribs 61, there are also two corresponding second guide posts 41.

[0043] In some optional embodiments, two third guide posts 613 are respectively provided at both ends of the connecting rib 61, and the support block 5 is provided with a third sliding groove 51. The third guide posts 613 can rotate and slide in the third sliding groove 51. The third guide posts 613 are connected to the connecting rib 61, and the connection method can be a fixed connection or a detachable connection, which is not limited in this application. In one example, the third guide posts 613 and the connecting rib 61 are made of the same material, and the third guide posts 613 and the connecting rib 61 are integrally formed. The end of the third guide post 613 is connected to the connecting rib 61, and the third guide post 613 is cylindrical, which facilitates the rotation and sliding of the third guide post 613 in the third sliding groove 51. The third sliding groove 51 is located at the support block 5 and corresponds to the third guide post 613. The third sliding groove 51 extends along the length direction of the support block 5, and the end of the third sliding groove 51 is arc-shaped, further improving the smoothness of the movement of the third guide post 613 in the third sliding groove 51.

[0044] Furthermore, since there are two support blocks 5, the two ends of the third guide post 613 are also correspondingly provided with third guide posts 613.

[0045] In some optional embodiments, a mounting post 7 is provided at the intersection of the two connecting ribs 61, and the connecting ribs 61 are rotatably connected to the mounting post 7. The mounting post 7 is cylindrical, and the two connecting ribs 61 are rotatably connected to the mounting post 7 at their intersection, thereby connecting the two connecting ribs 61 and improving the stability between the connecting components 6.

[0046] In some optional embodiments, the support block 5 is provided with a relief groove 52 for installing the connecting rib 61. The relief groove 52 provides space for the installation of the connecting rib 61, reduces the overall volume, and avoids affecting other parts.

[0047] Reference Figure 3 and Figure 4 In some optional embodiments, the support block 5 has an arc-shaped surface on the side opposite to the connecting assembly 6. This arc-shaped surface reduces the sharp edges of the support block 5, improving patient comfort and reducing the risk of injury.

[0048] In some optional embodiments, an adjusting member 8 is also connected to the end of the drive shaft 2. The adjusting member 8 has multiple first ridges 81 arranged around its periphery. The adjusting member 8 is cylindrical and is fitted onto the end of the drive shaft 2. The adjusting member 8 is fixedly connected to the drive shaft 2. When the adjusting member 8 rotates, it drives the drive shaft 2 to rotate. The outer diameter of the adjusting member 8 is larger than the outer diameter of the drive shaft 2, thus facilitating operator operation. The first ridges 81 extend along the height direction of the adjusting member 8. Multiple first ridges 81 are arranged around the periphery of the adjusting member 8 at intervals, preventing slippage during operation.

[0049] In some optional embodiments, the adjusting member 8 is also provided with a scale (not shown in the figure) on its periphery. The scale is provided so that the operator can know the angle of rotation and can accurately control the distance between the two support blocks 5.

[0050] Reference Figure 1 and Figure 2 and Figure 5 , Figure 5 The diagram shows a cross-sectional view of a handle provided in an embodiment of this application. A second ridge 12 is provided on the periphery of the housing 1. Multiple second ridges 12 are provided, spaced apart around the periphery of the housing 1. A handle 9 is also provided at the end of the housing 1 facing the adjusting member 8. The handle 9 has an inner cavity, which is divided into a first chamber 91 and a second chamber 92. The first chamber 91 is fitted onto the housing 1, and its inner wall is provided with a first engaging ridge (not shown in the figure) that engages with the first ridge 81 to prevent the handle 9 from rotating relative to the housing 1. The second chamber 92 is used to fit the adjusting member 8, and its inner wall is provided with a second engaging ridge (not shown in the figure) that engages with the second ridge 12 to prevent the handle 9 from rotating relative to the adjusting member 8.

[0051] The handle 9 is cylindrical, with an outer diameter larger than that of the housing 1. The handle 9 is fitted onto the housing 1 through a first chamber 91. A second ridge 12 is provided on the periphery of the housing 1, extending along its height. Multiple second ridges 12 are spaced apart around the periphery of the housing 1. A first engaging ridge is provided on the inner wall of the first chamber 91 to engage with the first ridge 81, preventing the handle 9 from rotating relative to the housing 1. When the handle 9 rotates, the housing 1 rotates accordingly. The handle 9 increases the contact area between the operator and the housing 1, making it easier for the operator to grip and improving ease of operation. However, the handle 9 can reciprocate along the height of the housing 1.

[0052] The second chamber 92 of the handle 9 is coaxially arranged with the first chamber 91 of the handle 9. Since the outer diameter of the adjusting member 8 is larger than the outer diameter of the housing 1, the inner diameter of the second chamber 92 of the handle 9 is larger than that of the first chamber 91, which can prevent the handle 9 from falling off one end of the adjusting member 8. The inner wall of the second chamber 92 of the handle 9 is provided with a second engaging ridge that engages with the second ridge 12 to prevent the handle 9 and the adjusting member 8 from rotating relative to each other, but the handle 9 can move along the height direction of the adjusting member 8.

[0053] In use, first move the handle 9 along the end of the housing 1 away from the adjusting member 8, that is, move the handle 9 upward, so that the handle 9 is disengaged from the adjusting member 8. At this time, the operator can hold the handle 9 with one hand and rotate the adjusting member 8 with the other hand, so that the transmission shaft 2 and the housing 1 rotate relative to each other. After the rotation is completed, move the handle 9 along the end of the housing 1 toward the adjusting member 8, that is, move the handle 9 downward, so that the second chamber 92 of the handle 9 is fitted with the adjusting member 8, thereby preventing the transmission shaft 2 from rotating with the housing 1, improving the stability between the transmission shaft 2 and the housing 1, and thus improving the accuracy of the operator's use.

[0054] Reference Figure 3 In some optional embodiments, a rotary bearing 10 is provided between the drive shaft 2 and the housing 1. The rotary bearing 10 can be a ball bearing or other bearings, and this application does not limit it. The rotary bearing 10 can reduce the friction between the drive shaft 2 and the housing 1, thereby improving the smoothness of rotation between the drive shaft 2 and the housing 1.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A molding apparatus, characterized in that, include: The housing (1) has an inner cavity, and the housing (1) has an installation port (11) on its periphery; The drive shaft (2) is located inside the housing (1) and is rotatably connected to the housing (1). The drive shaft (2) has a first thread and a second thread spaced apart on its circumference at the mounting port (11). The second thread is arranged opposite to the first thread. The first slider (3) is located at the mounting port (11), and the first slider (3) is connected to the drive shaft (2) through the first thread; The second slider (4) is located at the mounting port (11), and the second slider (4) is connected to the drive shaft (2) through the second thread; Two support blocks (5) are located on both sides of the housing (1); as well as The connecting component (6) includes two intersecting connecting ribs (61), the connecting ribs (61) being movably connected to the first slider (3), and the connecting ribs (61) being rotatable and slidable relative to the first slider (3); the connecting ribs (61) being movably connected to the second slider (4), and the connecting ribs (61) being rotatable and slidable relative to the second slider (4); The two ends of the connecting rib (61) are respectively movably connected to the two support blocks (5), and the ends of the connecting rib (61) can rotate and slide relative to the support blocks (5).

2. The molding apparatus according to claim 1, characterized in that, The first slider (3) is provided with a first guide post (31), and the connecting rib (61) is provided with a first sliding groove (611). The first guide post (31) can rotate and slide in the first sliding groove (611); and / or, the second slider (4) is provided with a second guide post (41), and the connecting rib (61) is provided with a second sliding groove (612). The second guide post (41) can rotate and slide in the second sliding groove (612).

3. The molding apparatus according to claim 1, characterized in that, Two third guide posts (613) are respectively provided at both ends of the connecting rib (61), and the support block (5) is provided with a third sliding groove (51). The third guide posts (613) can rotate and slide in the third sliding groove (51).

4. The molding apparatus according to claim 1, characterized in that, An installation column (7) is provided at the intersection of the two connecting ribs (61), and the connecting ribs (61) are rotatably connected to the installation column (7).

5. The molding apparatus according to claim 1, characterized in that, The support block (5) is provided with a relief groove (52) for installing the connecting rib (61).

6. The molding apparatus according to claim 1, characterized in that, The support block (5) is arranged in an arc shape on the side opposite to the connecting component (6).

7. The molding apparatus according to claim 1, characterized in that, The end of the drive shaft (2) is also connected to an adjusting member (8). The adjusting member (8) has a first ridge (81) on its periphery. Multiple first ridges (81) are provided, and multiple first ridges (81) are spaced around the periphery of the adjusting member (8).

8. The molding apparatus according to claim 7, characterized in that, The adjustment member (8) is also provided with a scale on its periphery.

9. The molding apparatus according to claim 7, characterized in that, The shell (1) is provided with a second ridge (12) on its periphery. Multiple second ridges (12) are provided and are spaced apart around the periphery of the shell (1). The end of the shell (1) facing the adjusting member (8) is also provided with a handle (9). The handle (9) has an inner cavity. The inner cavity of the handle (9) is divided into a first chamber (91) and a second chamber (92). The first chamber (91) is fitted onto the shell (1) and the inner wall of the first chamber (91) is provided with a first engaging ridge that engages with the first ridge (81) to prevent the handle (9) from rotating relative to the shell (1). The second chamber (92) is used to fit onto the adjusting member (8) and the inner wall of the second chamber (92) is provided with a second engaging ridge that engages with the second ridge (12) to prevent the handle (9) from rotating relative to the adjusting member (8).

10. The molding apparatus according to claim 1, characterized in that, A rotary bearing (10) is provided between the drive shaft (2) and the housing (1).

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