Die for automobile tail lamp

Abstract

The utility model discloses a mould for an automobile tail lamp, which comprises an obliquely arranged forming component and a driving unit, the forming component is arranged to be a lower side molded surface for forming a tail lamp component in an inclined posture and at least one back-off part positioned on the lower side molded surface, and the back-off part is vertical to the lower side molded surface; the forming assembly comprises a first sliding block connected to the action end of the driving unit, a second sliding block arranged in the same direction as the first sliding block, a first pitched roof and a second pitched roof, wherein the first pitched roof and the second pitched roof are arranged in the second sliding block in a penetrating mode, and an inverted buckle forming part is arranged on the end face of the second pitched roof. A first transmission part and a second transmission part which are opposite in the linear direction are arranged between the first sliding block and the second sliding block, and in the mold closing state, the first transmission part and the second transmission part are arranged in a spaced mode so that the first sliding block can slide relative to the second sliding block and drive the second inclined ejector to slide relative to the inclined guide groove. Therefore, the inverted buckle forming part is separated from the opening of the inverted buckle part.

Description

Technical Field

[0001] The utility model relates to the technical field of die equipment, and particularly relates to a die for an automobile tail lamp. Background Art

[0002] At present, for the forming of some shell components, usually two forming blocks are arranged, and the two forming blocks are respectively connected to the upper die set and the lower die set. For the shell components of automobile tail lamps, due to their irregular contour boundaries and complex surface shapes, especially the undercut parts on the surface shape, the conventional upper and lower dies and horizontal slider structures cannot demold them. However, when the undercut parts are located on the side of the automobile tail lamp, a relatively large forming slider structure is still required to form the side. And because the undercut parts hinder the demolding, a demolding slider different from the forming slider structure needs to be further designed. On the other hand, the forming slider structure of the main forming surface of the automobile tail lamp occupies a relatively large space on the side of the die, and a small forming slider structure cannot be additionally arranged. Therefore, a forming die for synchronously demolding the shell components of such automobile tail lamps and their undercut parts is needed. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a die for an automobile tail lamp.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions:

[0005] A die for an automobile tail lamp, comprising: a forming assembly arranged obliquely, and a driving unit for driving the forming assembly to linearly move along its oblique direction. The forming assembly is configured to form the lower side surface of a tail lamp component in an inclined posture, and at least one undercut part located on the lower side surface, and the undercut part is perpendicular to the lower side surface;

[0006] The forming assembly includes a first slider connected to the action end of the driving unit, a second slider arranged in the same direction as the first slider, a first lifter and a second lifter inserted in the second slider, and an undercut forming part is arranged on the end surface of the second lifter;

[0007] The second slider is arranged corresponding to the lower side surface. The end surfaces of the first lifter and the second lifter and the end surface of the second slider together form a forming surface of the lower side surface. The first lifter is fixedly connected to the first slider, the second lifter is fixedly connected to the second slider, and a lifter guide groove for the second lifter to slide on is supported by the first lifter. The lifter guide groove is arranged at an angle to the driving unit;

[0008] A first transmission part and a second transmission part facing each other in a linear direction are provided between the first slider and the second slider. In the mold-closed state, the first transmission part and the second transmission part are arranged at intervals so that the first slider slides relative to the second slider, driving the second lifter to slide relative to the inclined guide groove, so that the undercut forming part disengages from the opening of the undercut part, and when the first transmission part engages with the second transmission part, the forming assembly disengages from the lower mold surface.

[0009] Furthermore, the inclined guide groove is inclined with respect to the linear unit and defines the demolding stroke of the second lifter along the opening of the undercut part, and the second lifter is arranged to slide in the inclined guide groove.

[0010] Furthermore, a first stroke is defined between the first transmission part and the second transmission part. The first lifter disengages from the lower mold surface relative to the second lifter within the first stroke, and releases a second stroke extending along the opening of the undercut part for the second lifter within the second slider.

[0011] Furthermore, a limiting channel is provided in the first slider, a transmission bolt is inserted through the limiting channel, the transmission bolt passes through the limiting channel and is fixedly connected to the second slider, and a limiting opening for the transmission bolt to pass through is provided in the limiting channel, and the inner diameter of the limiting opening is smaller than the inner diameter of the transmission bolt.

[0012] Furthermore, a mating groove is further provided in the first slider, a mating post is provided in the second slider and inserted into the mating groove, a pressing spring is sleeved on the mating post, and the pressing spring abuts between the first slider and the second slider in the mold-closed state and acts on the second slider during the mold-opening process.

[0013] Furthermore, a forming channel for the first lifter and the second lifter to pass through is provided in the second slider. A limiting block is provided on the side of the forming channel away from the taillight component, the limiting block abuts against the back of the second lifter, and a first inclined guide surface corresponding to the first stroke is provided between the limiting block and the second lifter.

[0014] Furthermore, a communicating guide groove is provided on the outer boundaries of the first slider and the second slider. A first guide block is fixedly provided on the second slider and placed in the guide groove of the first slider. The first guide block remains in the guide groove of the first slider in the mold-opening state;

[0015] Second guide blocks are fixedly provided on the outer sides of the first slider and the second slider. Guide steps extending outward are further provided on the outer boundaries of the first slider and the second slider. The second guide blocks abut against the guide steps, and the first guide block and the second guide block are arranged in the same direction.

[0016] Furthermore, the boundary end faces of the first slider, the second slider and the limiting block facing away from the taillight component are flush.

[0017] Furthermore, a transmission induction block is fixedly provided on the action end of the driving unit, and a first detection module and a second detection module corresponding to the mold closing state and the mold opening state are provided on one side of the driving unit.

[0018] Furthermore, the number of the first angled ejector pins and the second angled ejector pins is two groups, and the backs of the two second angled ejector pins are both abutted against the limiting block.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] With the angled forming assembly and the driving unit of the utility model, the lower surface of the taillight component is formed by the second slider and the first angled ejector pin and the second angled ejector pin arranged therein, and the undercut part on the lower surface is formed by the second angled ejector pin, so that the forming assembly can be arranged by using the lateral space in the mold to form the lower surface of the taillight component, thereby releasing the upper and lower spaces of the mold for the arrangement of the upper and lower mold cores to form the upper and lower positive surfaces of the taillight component, effectively reducing the occupied space of the lower surface in the mold, further reducing the volume of the overall mold and lowering the cost;

[0021] With the utility model, the driving unit directly drives the first slider to demold. The second slider maintains the mold closing position during the first stroke, and the first slider moves relative to the second slider. At this time, the first angled ejector pin moves relative to the second angled ejector pin and pulls the second angled ejector pin to perform the demolding action of the undercut part through the angled guide groove. Subsequently, the first transmission block abuts against the second transmission block to form a transmission, and the first slider drives the second slider to disengage from the lower surface of the taillight component, thus completing the demolding of the lower surface and the undercut part thereon. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the taillight component, the forming assembly and the driving unit of the utility model;

[0023] Figure 2 is a schematic structural diagram of the forming surface of the utility model;

[0024] Figure 3 is a cross-sectional view of the taillight component of the utility model;

[0025] Figure 4 is a schematic structural diagram of the taillight component, the forming assembly and the driving unit of the utility model from another angle;

[0026] Figure 5 is a cross-sectional view of the forming assembly of the utility model;

[0027] Figure 6 is an exploded view of the second guide block and the forming assembly of the utility model;

[0028] Figure 7 Schematic diagram of the state after the reverse buckling forming part of the present utility model is separated from the reverse buckling part;

[0029] Figure 8 Schematic diagram of the cooperation between the first inclined ejector and the second inclined ejector of the present utility model;

[0030] In the figure: 1. Driving unit; 1.1 Action end;

[0031] 2. Tail lamp component; 2.1 Lower side profile; 2.11 First surface profile; 2.12 Second surface profile; 2.2 Reverse buckling part;

[0032] 3. First slider; 3.1 Limiting channel; 3.2 Limiting port; 3.3 Matching groove;

[0033] 4. Second slider; 4.1 Matching column; 4.2 Pressing spring; 4.3 Forming channel;

[0034] 5. First inclined ejector; 5.1 Inclined guide groove; 6. Second inclined ejector; 6.1 Reverse buckling forming part; 6.2 Inclined guide block;

[0035] 7. Limiting block; 8. First inclined guide surface; 9. Second inclined guide surface; 10. Guide groove;

[0036] 11. First guide block; 12. Second guide block; 13. Inclined guide step;

[0037] 14. Guide step; 15. Transmission induction block; 16. First detection module; 17. Second detection module; 18. Sliding bottom surface; 19. Positioning column; 20. Positioning spring; 21. First adjusting block; 22. Second adjusting block; 23. First transmission part; 24. Second transmission part; 25. Transmission bolt; Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0039] It should be understood that although the terms upper, middle, lower, top, one end, etc. appear in this text to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for easy understanding, rather than to define any directional or sequential limitations.

[0040] Such as Figure 1-8As shown in the figure, a mold for an automotive taillight includes:

[0041] A forming component arranged obliquely, and a driving unit 1 for driving the forming component to linearly move along its oblique direction. The forming component is configured to form the lower surface 2.1 of the taillight component 2 in an inclined posture, and at least one undercut portion 2.2 located on the lower surface 2.1, and the undercut portion 2.2 is perpendicular to the lower surface 2.1;

[0042] The forming component includes a first slider 3 connected to the action end 1.1 of the driving unit 1, a second slider 4 arranged in the same direction as the first slider 3, a first lifter 5 and a second lifter 6 inserted into the second slider 4, and an undercut forming portion 6.1 is provided on the end surface of the second lifter 6;

[0043] The second slider 4 is arranged corresponding to the lower surface 2.1. The first lifter 5 is fixedly connected to the first slider 3, the second lifter 6 is fixedly connected to the second slider 4, and an inclined guide groove 5.1 for supporting the second lifter 6 to slide thereon is provided on the first lifter 5. The inclined guide groove 5.1 is arranged at an angle with the driving unit 1. The second slider 4 is provided with an inclined guide block 6.2 placed in the inclined guide groove 5.1, and the inclined guide groove 5.1 and the inclined guide block 6.2 are arranged in a T shape;

[0044] A first transmission part 23 and a second transmission part 24 are arranged oppositely in the linear direction between the first slider 3 and the second slider 4. In the mold closing state, the first transmission part 23 and the second transmission part 24 are arranged at intervals. During the mold opening process, the driving unit 1 pulls the first slider 3 to move, so that the first slider 3 slides relative to the second slider 4, and drives the second lifter 6 to slide relative to the inclined guide groove 5.1, so that the undercut forming portion 6.1 disengages from the opening of the undercut portion 2.2, and the first transmission part 23 engages with the second transmission part 24, so that the forming component disengages from the lower surface 2.1.

[0045] As an example, the angle formed by the linear direction of the driving unit 1, that is, the mold opening direction and the horizontal plane is 35°, and the angle formed by the inclined guide groove 5.1 and the horizontal plane is 20°

[0046] From Figure 1 、 3 、4, it can be seen that, among them, the lower surface 2.1 includes a first surface type 2.11 inclined downward and a second surface type 2.12 inclined upward. The second slider 4, the first lifter 5 and the second lifter 6 together form the forming surface of the first surface type 2.11, and the bottom of the second slider 4 forms the forming surface of the second surface type 2.12.

[0047] As a further embodiment of the forming component, the driving unit 1 can be optionally a linearly acting electric cylinder or an oil cylinder, the first slider 3 is directly connected to the action end 1.1 of the driving unit 1, and the bottom of the first slider 3 and the second slider 4 are coplanar and have a sliding bottom surface arranged along the mold opening direction thereof, a limiting channel 3.1 is provided in the first slider 3, a transmission bolt 25 is passed through the limiting channel 3.1, the transmission bolt 25 passes through the limiting channel 3.1 and is fixedly connected to the second slider 4, and a limiting opening 3.2 is provided in the limiting channel 3.1 for the transmission bolt 25 to pass through, the inner diameter of the limiting opening 3.2 is smaller than the inner diameter of the limiting channel 3.1, and the inner diameter of the limiting opening 3.2 is smaller than the inner diameter of the large end of the transmission bolt 25, that is, the limiting passage 3.1 is provided with a plurality of movable members 3. The limiting step formed between the opening 3.2 and the limiting channel 3.1 serves as the first transmission part 23, and the large end of the transmission bolt 25 serves as the second transmission part 24, defining a first stroke between the two. Within this stroke, the driving unit 1 directly drives the first slider 3 to slide for demolding, while the second slider 4 is still maintained in the mold closing position. At this time, the sliding of the first slider 3 drives the first inclined top 5, forcing the second inclined top 6 to perform a relative sliding action under the action of the inclined guide groove 5.1 to complete the separation of the undercut molding part 6.1 on the second inclined top 6 from the undercut part 2.2. In addition, after the first transmission part 23 abuts against the second transmission part 24, the molding assembly starts to execute the third stroke, within which the molding assembly is completely separated from the lower side mold surface 2.1.

[0048] Specifically, a first stroke is defined between the first transmission part 23 and the second transmission part 24, and the first inclined top 5 is separated from the lower molding surface relative to the second inclined top 6 in the first stroke, and a second stroke extending along the opening of the undercut part 2.2 is released for the second inclined top 6 in the second slider 4. During the separation of the first inclined top 5, the second inclined top 6 gradually separates from the undercut part 2.2 along the direction of the second stroke. After the first stroke is consumed, the undercut molding part 6.1 on the second inclined top 6 is completely separated from the undercut part 2.2, and the second slider 4 and the second inclined top 6 are allowed to separate along the linear mold opening direction.

[0049] from Figure 5 It can be seen that the first inclined top 5 is connected to the first slider 3 by bolts and is inserted into the second slider 4. The second inclined top 6 is constrained on the first inclined top 5 by the inclined guide groove 5.1 and is inserted into the second slider 4. The inclined guide groove 5.1 is arranged obliquely to the linear direction of the drive unit 1, or the inclined guide groove 5.1 is oblique to the mold opening direction of the first slider 3 and the second slider 4. The second inclined top 6 is arranged to slide in the inclined guide groove 5.1, and the demolding stroke of the second inclined top 6 is defined along the opening direction of the undercut part 2.2.

[0050] Further references Figure 5, as a further embodiment of the cooperation between the second lifter 6 and the second slider 4, a molding channel 4.3 is provided in the second slider 4 for the first lifter 5 and the second lifter 6 to pass through. A limiting block 7 is provided on the molding channel 4.3 away from the taillight member 2. The limiting block 7 abuts against the back of the second lifter 6. A first inclined guide surface 8 corresponding to the first stroke is provided between the limiting block 7 and the second lifter 6. The second lifter 6 has an inclined guide step 13 fitted in the molding channel 4.3. A second inclined guide surface 9 in the same direction as the second stroke is provided on the inclined guide step 13. In the second stroke, the undercut forming portion 6.1 on the second lifter 6 is disengaged from the undercut portion 2.2 under the restraint of the first inclined guide surface 8 and the second inclined guide surface 9. In this way, the stability and reliability of the demolding of the undercut portion 2.2 are ensured, and the molding quality of the undercut portion 2.2 is prevented from being affected by the movement of the second lifter 6.

[0051] As a further embodiment of the cooperation between the first slider 3 and the second slider 4, a mating groove 3.3 is further provided in the first slider 3. A mating post 4.1 is provided in the second slider 4 and passes through the mating groove 3.3. A compression spring 4.2 is sleeved on the mating post 4.1. The compression spring 4.2 abuts between the first slider 3 and the second slider 4 in the mold-closed state, providing a certain buffer for the first slider 3 and the second slider 4 to reach the mold-closed position in place. The compression spring 4.2 acts on the second slider 4 during the mold-opening process and holds the second slider 4 in the current mold-closed position.

[0052] In some other embodiments, a positioning post 19 is further provided at the bottom of the second slider 4. A positioning spring 20 abuts against the back of the positioning post 19. A positioning groove matching the positioning post 19 is provided at the bottom of the second slider 4. The positioning post 19 is used to position the second slider 4 in the mold-closed position, and the positioning spring 20 and the compression spring 4.2 are arranged approximately perpendicular to each other. Based on this embodiment, the molding assembly is arranged in an inclined posture to mold the taillight member 2 in an inclined posture. Through the above-mentioned positioning spring 20 and compression spring 4.2, when the first slider 3 disengages from the second slider 4 in the first stroke, the position stability of the second slider 4 in the first stroke is ensured, and the sliding of the second slider 4 is prevented.

[0053] As Figure 6 shown, in some other embodiments, to ensure the stability of the sliding between the first slider 3 and the second slider 4, a communicating guide groove 10 is provided on the outer boundaries of the first slider 3 and the second slider 4. A first guide block 11 placed in the guide groove 10 is fixedly provided on the second slider 4. The first guide block 11 is strip-shaped and remains in the guide groove 10 of the first slider 3 in both the mold-opening state and the mold-closed state, so as to improve the reliability of the first slider 3 and the second slider 4 during the sliding process;

[0054] Among them, a fixed second guide block 12 is also provided on the outer side of the first slider 3 and the second slider 4, and a guide step 14 extending outward is also provided on the outer boundary of the first slider 3 and the second slider 4. The first guide block 11 and the second guide block 12 are arranged in the same direction, and the guide steps 14 of the first slider 3 and the second slider 4 are assembled with each other and pressed against the bottom of the second guide block 12. The second guide block 12 is fixedly arranged in the mold and is specifically located above the sliding bottom surface 18. In this way, the first slider 3 and the second slider 4 are pressed against the sliding bottom surface 18 to reduce the movement gap between the two in the direction perpendicular to the sliding direction.

[0055] The above-mentioned limiting channel 3.1, guide groove 10 and matching groove 3.3 are all arranged along the linear direction of the driving unit 1, that is, the mold opening direction.

[0056] Reference Figure 1 As shown, in other embodiments, in order to facilitate the spatial arrangement of the molding assembly in the mold, the boundary end faces of the first slider 3, the second slider 4 and the limit block 7 facing away from the taillight component 2 are arranged flush, and their boundary end faces are all arranged as inclined surfaces, a first adjusting block 21 is provided on the boundary end face of the first slider 3, and a second adjusting block 22 is provided on the boundary end face of the second slider 4, and the first adjusting block 21 blocks the limiting channel 3.1 and the bolt connection hole between the first inclined top 5 and the first slider 3, wherein the first adjusting block 21 and the second adjusting block 22 are both fixed by bolts, and the gap relative to the boundary end face can be adjusted by the bolts to ensure the flatness of the entire boundary end face, and it is worth mentioning that the limit block 7 is also fixed to the second slider 4 by bolts.

[0057] Specifically, a transmission sensing block 15 is fixedly provided on the action end 1.1 of the driving unit 1, and a first detection module 16 and a second detection module 17 corresponding to the mold closing state and the mold opening state are provided on one side of the driving unit 1, wherein the transmission sensing block 15 is L-shaped and extends on one side of the driving unit 1 to reduce the space occupied by the transmission sensing block 15 and its mounting base, and the start of the molding assembly can be accurately controlled by the first detection module 16 and the second detection module 17.

[0058] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A mold for automobile taillights, characterized in that: include: An obliquely arranged molding component, and a driving unit (1) for driving the molding component to move linearly along the oblique direction thereof, the molding component being arranged to mold a lower profile (2.1) of a taillight component (2) in an inclined posture, and at least one undercut portion (2.2) located on the lower profile (2.1), the undercut portion (2.2) being perpendicular to the lower profile (2.1); The molding assembly comprises a first slider (3) connected to an action end (1.1) of a driving unit (1), a second slider (4) arranged in the same direction as the first slider (3), a first inclined top (5) and a second inclined top (6) inserted into the second slider (4), and an undercut molding portion (6.1) is provided on the end surface of the second inclined top (6); The second slider (4) is arranged corresponding to the lower profile (2.1); the end surfaces of the first inclined top (5) and the second inclined top (6) together with the end surface of the second slider (4) form a molding surface of the lower profile (2.1); the first inclined top (5) is fixedly connected to the first slider (3); the second inclined top (6) is fixedly connected to the second slider (4); and the first inclined top (5) is provided with an inclined guide groove (5.1) for supporting the second inclined top (6) to slide thereon; the inclined guide groove (5.1) is arranged at an angle with the drive unit (1); A first transmission part (23) and a second transmission part (24) which are opposite to each other in a linear direction are provided between the first slider (3) and the second slider (4). In a mold closing state, the first transmission part (23) and the second transmission part (24) are arranged at a distance so that the first slider (3) slides relative to the second slider (4) and drives the second inclined top (6) to slide relative to the inclined guide groove (5.1) so that the undercut molding part (6.1) is disengaged from the opening of the undercut part (2.2), and the first transmission part (23) is then engaged with the second transmission part (24) so ​​that the molding component is disengaged from the lower mold surface (2.1).

2. A mold for automobile taillights according to claim 1, characterized in that: The inclined guide groove (5.1) is arranged obliquely to the linear unit and defines a demoulding stroke of the second inclined top (6) along the opening of the undercut portion (2.2); the second inclined top (6) is arranged to slide in the inclined guide groove (5.1).

3. The mold for automobile taillights according to claim 1, characterized in that: A first stroke is defined between the first transmission part (23) and the second transmission part (24), and the first inclined top (5) is separated from the lower profile (2.1) relative to the second inclined top (6) within the first stroke, and a second stroke extending along the opening of the undercut part (2.2) is released in the second slide block (4) for the second inclined top (6).

4. The mold for automobile taillights according to claim 1, characterized in that: A limiting channel (3.1) is provided in the first sliding block (3), a driving bolt (25) is passed through the limiting channel (3.1), the driving bolt (25) passes through the limiting channel (3.1) and is fixedly connected to the second sliding block (4), and a limiting opening (3.2) is provided in the limiting channel (3.1) for the driving bolt (25) to pass through, and the inner diameter of the limiting opening (3.2) is smaller than the inner diameter of the driving bolt (25).

5. The mold for automobile taillights according to claim 1, characterized in that: The first slider (3) is also provided with a matching groove (3.3), the second slider (4) is provided with a matching column (4.1) which is inserted into the matching groove (3.3), the matching column (4.1) is sleeved with a pressure spring (4.2), the pressure spring (4.2) is in contact between the first slider (3) and the second slider (4) in the mold closing state, and acts on the second slider (4) in the mold opening process.

6. The mold for automobile taillights according to claim 1, characterized in that: The second sliding block (4) is provided with a forming channel (4.3) for the first inclined top (5) and the second inclined top (6) to pass therethrough, the forming channel (4.3) is provided with a limit block (7) away from the taillight component (2), the limit block (7) abuts against the back of the second inclined top (6), and a first inclined guide surface (8) corresponding to the first stroke is provided between the limit block (7) and the second inclined top (6).

7. The mold for automobile taillights according to claim 1, characterized in that: The outer boundaries of the first slider (3) and the second slider (4) are provided with communicating guide grooves (10); the second slider (4) is fixedly provided with a first guide block (11) inserted into the guide groove (10); the first guide block (11) is retained in the guide groove (10) of the first slider (3) in the mold opening state; A second guide block (12) is fixedly arranged on the outer side of the first slider (3) and the second slider (4); a guide step (14) extending outward is also arranged on the outer boundary of the first slider (3) and the second slider (4); the second guide block (12) abuts against the guide step (14); and the first guide block (11) and the second guide block (12) are arranged in the same direction.

8. The mold for automobile taillights according to claim 1, characterized in that: The first sliding block (3), the second sliding block (4) and the limiting block (7) are arranged flush with the boundary end faces facing away from the tail light component (2).

9. The mold for automobile taillights according to claim 1, characterized in that: A transmission sensing block (15) is fixedly provided on the action end (1.1) of the driving unit (1), and a first detection module (16) and a second detection module (17) corresponding to a mold closing state and a mold opening state are provided on one side of the driving unit (1).

10. The mold for automobile taillights according to claim 1, characterized in that: The number of the first inclined tops (5) and the second inclined tops (6) is two groups, and the backs of the two second inclined tops (6) are both in contact with the limiting block (7).

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