Novel injection mold for automobile parts

Abstract

A novel automobile part injection mold comprises a split type mold, a second locking block, a main locking driving table, a first locking block, a separation driving block, a separation driven block, a main body positioning block, a driven screw, an unlocking screw and a delay piece, a separation positioning sliding rod is arranged on the side face of the main body positioning block, and a separation positioning sliding groove is formed in the side face of the split type mold. The separation positioning sliding grooves are matched with the separation positioning sliding rods, the separation positioning sliding grooves are connected with the separation positioning sliding rods, the separation positioning sliding grooves slide on the outer sides of the separation positioning sliding rods, the four sets of split molds surround the side face of the main body positioning block and are connected with one another, and the middle of the split mold array set is connected with the main body positioning block. The main body positioning block and the four groups of split molds jointly form a half injection mold main body, the top of each split mold is provided with an expansion driven table, and the side surface of each expansion driven table is provided with a driven block connecting column.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts injection molding, in particular to a novel automobile parts injection molding mold. Background Art

[0002] The existing patent (Announcement No.: CN116494473A) proposes a new type of automobile parts injection mold, the upper mold and the lower mold side are fixedly connected with fixing ears, the fixing ears are penetrated and threaded with a bolt and nut combination, and also includes a cooling device, which is provided with two groups and symmetrically distributed on the upper mold and the lower mold. The two groups of cooling devices are fixedly connected to the upper mold and the lower mold respectively, and the cooling device is used to cool the upper mold and the lower mold, and a demoulding device, which is provided with two groups and distributed inside the upper mold and the lower mold respectively. However, this device "drives the extrusion piston to move, and the extrusion piston drives the ejector block to extend through the telescopic push rod". The upper and lower molds are both integrated designs, so that the parts will rub against the side wall of the mold when they are ejected. Long-term use may affect the accuracy of the mold during use and reduce the service life of the mold. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a method of driving an unlocking screw in the reverse direction by a screw driving handle, so that the unlocking screw rotates and drives the total locking driving platform to lift at the same time, and the total locking driving platform drives the No. 2 locking block and the No. 1 locking block to lift, so that the No. 1 locking hole is separated from the No. 1 locking column, and the No. 2 locking column is separated from the No. 2 locking hole, thereby completing the unlocking of the half injection mold body; when the unlocking screw rotates through a certain angle, it drives the driven screw to rotate, so that the driven screw rotates to lift the separation driving block; during the lifting of the separation driving block, the driven block connecting platform pulls the split mold to expand outward, so that each split mold is separated from each other, and the split mold is completely separated from the parts; during the separation process, a large amount of friction will not be generated between the side of the mold and the parts, thereby reducing mold loss and increasing the service life of the mold. A new type of automobile parts injection mold.

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

[0005] A new type of automobile parts injection mold, including a split mold, a second locking block, a total locking drive platform, a first locking block, a separation drive block, a separation driven block, a main body positioning block, a driven screw, an unlocking screw, and a delay plate. The side of the main body positioning block is provided with a separation positioning slide bar, and the side of the split mold is provided with a separation positioning slide groove, the separation positioning slide groove is adapted to the separation positioning slide bar, the separation positioning slide groove is connected to the separation positioning slide bar, and the separation positioning slide groove slides outside the separation positioning slide bar. Four groups of split molds surround the side of the main body positioning block and are connected to each other. The split mold The middle part of the array group is connected to the main body positioning block, and the main body positioning block and the four groups of split molds together constitute the main body of the semi-injection mold. The top of the split mold is provided with an expansion driven platform, the side of the expansion driven platform is provided with a driven block connecting column, the side of the separation driven block is provided with a driven block connecting platform, the bottom of the driven block connecting platform is rotatably connected to the driven block connecting column, the top of the separation driven block is provided with an upper claw connecting platform, and the middle part of the main body positioning block is provided with a driven screw connecting groove, the driven screw connecting groove is adapted to the driven screw, the driven screw connecting groove is connected to the driven screw, and the driven screw rotates inside the driven screw connecting groove.

[0006] The driven screw has a screw mounting groove inside, a lower driven slide groove is provided at the bottom of the screw mounting groove, a delay plate is adapted to the screw mounting groove, the delay plate is connected to the screw mounting groove, the delay plate rotates inside the screw mounting groove, the delay plate is placed at the bottom of the screw mounting groove, a lower delay slider is provided at the bottom of the delay plate, the lower delay slider is adapted to the lower driven slide groove, the lower delay slider is connected to the lower driven slide groove, the lower delay slider slides inside the lower driven slide groove, an upper delay slide groove is provided at the top of the delay plate, a screw driving handle is provided at the top of the unlocking screw, a screw mounting block is provided at the bottom of the unlocking screw, the screw mounting block is adapted to the screw mounting groove, the screw mounting block is connected to the screw mounting groove, and the screw mounting block rotates inside the screw mounting groove.

[0007] The screw mounting block is placed on the upper part of the delay plate, and an upper delay slider is provided at the bottom of the screw mounting block, the upper delay slider is adapted to the upper delay slide groove, the upper delay slider is connected to the upper delay slide groove, and the upper delay slider slides inside the upper delay slide groove; a separation drive screw is provided at the top of the driven screw, the separation drive screw surrounds the outside of the unlocking screw, the separation drive block is threadedly connected to the separation drive screw, a separation drive claw is provided on the side of the separation drive block, an upper claw connecting block is provided at the end of the separation drive claw, an upper claw connecting platform is rotatably connected to the upper claw connecting block, a total locking drive platform is threadedly connected to the unlocking screw, and a No. 1 locking platform is provided on the front and rear sides of the total locking drive platform. Beneficial Effects

[0008] 1. When the injection molding of the automobile parts injection mold of the utility model is completed and the mold is demoulded, the unlocking screw is rotated in the opposite direction by the screw driving handle. The unlocking screw rotates and drives the total locking driving platform to lift. The total locking driving platform drives the No. 2 locking block and the No. 1 locking block to lift, so that the No. 1 locking hole is separated from the No. 1 locking column, and the No. 2 locking column is separated from the No. 2 locking hole, thereby completing the unlocking of the half injection mold body. When the unlocking screw rotates through a certain angle, it drives the delay plate to rotate. When the delay plate rotates through a certain angle, it drives the driven screw to rotate. The rotation of the driven screw lifts the separation driving block. During the lifting of the separation driving block, the driven block connecting platform pulls the split mold to expand outward, so that each split mold is separated from each other, and the split mold is completely separated from the parts. During the separation process, no large amount of friction will be generated between the side of the mold and the parts, thereby reducing mold loss and increasing the service life of the mold.

[0009] 2. The lower delay slider of the utility model slides inside the lower driven slide groove, and the upper delay slider slides inside the upper delay slide groove, so that the unlocking screw can drive the driven screw to rotate only after rotating a certain angle, so that in the process of reversely rotating the unlocking screw, the total locking drive platform is first lifted to release the lock of the half injection mold body, and after the unlocking is completed, the driven screw rotates to complete the expansion operation of the split mold, avoiding the movement of the split mold being stuck by the No. 1 locking column, thereby ensuring the stable and effective operation of the demolding operation.

[0010] 3. The utility model connects the No. 1 locking block to the No. 1 locking platform through a spring, and the No. 2 locking block to the No. 2 locking platform through a spring, so that when the unlocking screw rotates forward to drive the total locking driving platform downward, the No. 2 locking block and the No. 1 locking block will not be directly stuck on the surface of the split mold due to the descent of the total locking driving platform, ensuring that the unlocking screw can continue to rotate after the No. 2 locking block and the No. 1 locking block are pressed against the surface of the split mold until the split mold is completely closed, and the No. 1 locking column and the No. 2 locking column are pushed by the spring to be inserted into the No. 1 locking hole and the No. 2 locking hole respectively, ensuring that the reset operation of this mold can be carried out stably and effectively.

[0011] 4. The No. 1 locking platform and the No. 2 locking platform of the utility model are both designed with triangular reinforcing ribs, so that the total locking drive platform is less likely to deform during the pressing process, further increasing the service life of the total locking drive platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the structure of a novel automobile parts injection mold.

[0013] Figure 2 This is a side cross-sectional view of a novel automobile parts injection mold described in the utility model.

[0014] Figure 3 The main driving mechanism of the utility model explodes Figure 1 .

[0015] Figure 4 The main driving mechanism of the utility model explodes Figure 2 .

[0016] Figure 5 This is an exploded view of the locking mechanism described in the present utility model.

[0017] Figure 6 It is an exploded view of the demoulding and separation mechanism described in the utility model.

[0018] Figure 7 This is a schematic diagram of the split mold structure described in the utility model.

[0019] Figure 8 This is a schematic diagram of the structure of the separation driven block described in the utility model.

[0020] Fig. 9 This is a schematic structural diagram of the total locking drive platform described in the utility model.

[0021] Fig.10 This is a schematic diagram of the structure of the separation drive block described in the utility model.

[0022] Fig.11 This is a schematic diagram of the main body positioning block structure of the utility model. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below according to the accompanying drawings and embodiments:

[0024] Embodiment 1:

[0025] A novel automobile parts injection mold, comprising a split mold 1, a second locking block 2, a total locking drive platform 5, a first locking block 7, a separation drive block 13, a separation driven block 15, a main body positioning block 18, a driven screw 20, an unlocking screw 23, and a delay plate 27. The main body positioning block 18 has a separation positioning slide bar 32 on its side, and the split mold 1 has a separation positioning slide groove 33 on its side. The separation positioning slide groove 33 is adapted to the separation positioning slide bar 32, the separation positioning slide groove 33 is connected to the separation positioning slide bar 32, and the separation positioning slide groove 33 slides on the outside of the separation positioning slide bar 32. Four groups of split molds 1 surround the side of the main body positioning block 18 and are connected to each other. The split mold 1 The middle part of the array group is connected to the main body positioning block 18, and the main body positioning block 18 and the four-group split mold 1 together constitute the main body of the semi-injection mold. The top of the split mold 1 is provided with an expansion driven platform 6, and the side of the expansion driven platform 6 is provided with a driven block connecting column 17. The side of the separation driven block 15 is provided with a driven block connecting platform 16, and the bottom of the driven block connecting platform 16 is rotatably connected to the driven block connecting column 17. The top of the separation driven block 15 is provided with an upper claw connecting platform 34. The middle part of the main body positioning block 18 is provided with a driven screw connecting groove 19, and the driven screw connecting groove 19 is adapted to the driven screw 20. The driven screw connecting groove 19 is connected to the driven screw 20, and the driven screw 20 rotates inside the driven screw connecting groove 19.

[0026] Embodiment 2:

[0027] The driven screw 20 of the utility model has a screw mounting groove 22 inside, and a lower driven slide groove 21 is provided at the bottom of the screw mounting groove 22. The delay plate 27 is adapted to the screw mounting groove 22, and the delay plate 27 is connected to the screw mounting groove 22. The delay plate 27 rotates inside the screw mounting groove 22. The delay plate 27 is placed at the bottom of the screw mounting groove 22. The bottom of the delay plate 27 has a lower delay slider 31, and the lower delay slider 31 is adapted to the lower driven slide groove 21. The lower delay slider 31 is connected to the lower driven slide groove 21, and the lower delay slider 31 slides inside the lower driven slide groove 21. The lower delay slider The block 31 slides inside the lower driven slide groove 21, and the upper delay slider 26 slides inside the upper delay slide groove 28, so that the unlocking screw 23 can drive the driven screw 20 to rotate only after a certain angle is rotated, so that in the process of reversely rotating the unlocking screw 23, the total locking drive platform 5 is first lifted to release the lock of the half injection mold body. After the unlocking is completed, the driven screw 20 rotates to complete the expansion operation of the split mold 1, avoiding the movement of the split mold 1 from being stuck by the No. 1 locking column 30, ensuring the stable and effective operation of the demoulding operation. The delay piece 27 has an upper delay slide groove 28 on the top, and the unlocking screw The top of the mold 23 is provided with a screw driving handle 4, and the unlocking screw 23 is rotated in the reverse direction by the screw driving handle 4. When the unlocking screw 23 rotates, the total locking driving platform 5 is lifted, and the total locking driving platform 5 drives the No. 2 locking block 2 and the No. 1 locking block 7 to lift, so that the No. 1 locking hole 8 is separated from the No. 1 locking column 30, and the No. 2 locking column 37 is separated from the No. 2 locking hole 36, and the half injection mold body is unlocked. When the unlocking screw 23 rotates through a certain angle, it drives the delay plate 27 to rotate. When the delay plate 27 rotates through a certain angle, it drives the driven screw 20 to rotate. The driven screw 20 rotates to make The separation drive block 13 is lifted, and during the lifting process of the separation drive block 13, the driven block connecting platform 16 pulls the split mold 1 to expand outward, so that the various split molds 1 are separated from each other, and the split mold 1 is completely separated from the parts. During the separation process, a large amount of friction will not be generated between the side of the mold and the parts, which reduces mold loss and increases the service life of the mold. The bottom of the unlocking screw 23 is provided with a screw mounting block 24, which is adapted to the screw mounting groove 22, and the screw mounting block 24 is connected to the screw mounting groove 22, and the screw mounting block 24 rotates inside the screw mounting groove 22.

[0028] Embodiment 3:

[0029] The screw mounting block 24 of the utility model is placed on the upper part of the delay plate 27, and the bottom of the screw mounting block 24 is provided with an upper delay slider 26, which is adapted to the upper delay slide groove 28, and the upper delay slider 26 is connected to the upper delay slide groove 28, and the upper delay slider 26 slides inside the upper delay slide groove 28. A separation drive screw 29 is provided on the top of the driven screw 20, and the separation drive screw 29 surrounds the outer side of the unlocking screw 23. The separation drive block 13 is threadedly connected with the separation drive screw 29, and a separation drive claw 14 is provided on the side of the separation drive block 13. An upper claw connecting block 35 is provided at the end of the separation drive claw 14, and an upper claw connecting platform 34 is rotatably connected with the upper claw connecting block 35. The total locking drive platform 5 is threadedly connected with the unlocking screw 23, and the total locking drive platform 5 is provided with a No. 1 locking platform 9 on both sides of the front and rear. The No. 1 locking platform 9 and the No. 2 locking platform 25 are both designed with triangular reinforcing ribs, so that the total locking drive platform 5 is less likely to deform during the pressing process, and the service life of the total locking drive platform 5 is further increased.

[0030] Embodiment 4:

[0031] The surface of the No. 1 locking platform 9 of the utility model is provided with a No. 1 locking groove 10, the top of the No. 1 locking block 7 is provided with a No. 1 locking slide bar 11, the No. 1 locking slide bar 11 is adapted to the No. 1 locking groove 10, the No. 1 locking slide bar 11 is connected to the No. 1 locking groove 10, the No. 1 locking slide bar 11 slides inside the No. 1 locking groove 10, the top of the No. 1 locking block 7 is connected to the No. 1 locking platform 9 by a spring, the No. 1 locking block 7 is connected to the No. 1 locking platform 9 by a spring, the No. 2 locking block 2 is connected to the No. 2 locking platform 25 by a spring, so that the unlocking screw 23 is rotated forward to drive the total locking driving platform 5 to press down, the No. 2 locking block 2 and the No. 1 locking block 7 will not As the total locking drive platform 5 descends, it is directly stuck on the surface of the split mold 1, ensuring that the unlocking screw 23 can continue to rotate after the No. 2 locking block 2 and the No. 1 locking block 7 are pressed against the surface of the split mold 1 until the split mold 1 is completely closed. The No. 1 locking column 30 and the No. 2 locking column 37 are pushed by the spring and inserted into the No. 1 locking hole 8 and the No. 2 locking hole 36 respectively, ensuring that the resetting operation of this mold can be carried out stably and effectively. The No. 1 locking block 7 has a No. 1 locking column 30 at the bottom, and the split mold 1 has a No. 1 locking hole 8 and a No. 2 locking hole 36 on the surface. The No. 1 locking hole 8 is arranged vertically, and the No. 2 locking hole 36 is arranged horizontally.

[0032] Embodiment 5:

[0033] The No. 1 locking column 30 described in the utility model is adapted to the No. 1 locking hole 8, the No. 1 locking column 30 is connected to the No. 1 locking hole 8, the No. 1 locking column 30 is inserted into the No. 1 locking hole 8, the left and right sides of the total locking drive platform 5 are provided with a No. 2 locking platform 25, the surface of the No. 2 locking platform 25 is provided with a No. 2 locking groove 12, the top of the No. 2 locking block 2 is provided with a No. 2 locking slide bar 3, the No. 2 locking slide bar 3 is adapted to the No. 2 locking groove 12, and the No. 2 locking slide bar 3 is connected to the No. 2 locking groove 12.

[0034] Embodiment 6:

[0035] The No. 2 locking slide bar 3 of the utility model slides inside the No. 2 locking groove 12, the top of the No. 2 locking block 2 is connected to the No. 2 locking platform 25 by a spring, the bottom of the No. 2 locking block 2 is provided with a No. 2 locking column 37, the No. 2 locking column 37 is adapted to the No. 2 locking hole 36, the No. 2 locking column 37 is connected to the No. 2 locking hole 36, and the No. 2 locking column 37 is inserted into the No. 2 locking hole 36.

[0036] Embodiment 7:

[0037] The utility model installation steps are as follows: insert the driven screw 20 into the driven screw connecting groove 19 of the main body positioning block 18, insert the delay plate 27 into the screw mounting groove 22 of the driven screw 20, insert the lower delay slider 31 of the delay plate 27 into the lower driven slide groove 21 of the driven screw 20, insert the screw mounting block 24 of the unlocking screw 23 into the screw mounting groove 22 of the driven screw 20, press the screw mounting block 24 against the upper part of the delay plate 27, insert the upper delay slider 26 of the screw mounting block 24 into the upper delay slide groove 28 of the delay plate 27, thread the separation drive block 13 with the separation drive screw 29 of the driven screw 20, sleeve the separation positioning slide groove 33 of the split mold 1 on the outside of the separation positioning slide bar 32 of the main body positioning block 18, and separate the driven block 15 with the separation drive screw 29 of the driven screw 20. The block connecting platform 16 is rotatably connected with the driven block connecting column 17 of the split mold 1, the upper support claw connecting block 35 of the separation driving block 13 is rotatably connected with the separation driven block 15 of the driven block connecting platform 16, the total locking driving platform 5 is threadedly connected with the unlocking screw 23, the No. 1 locking slide bar 11 of the No. 1 locking block 7 is inserted into the No. 1 locking groove 10 of the total locking driving platform 5, the top of the No. 1 locking block 7 is connected to the No. 1 locking platform 9 of the total locking driving platform 5 through a spring, the No. 1 locking column 30 of the No. 1 locking block 7 is pressed into the No. 1 locking hole 8 of the split mold 1, the No. 2 locking slide bar 3 of the No. 2 locking block 2 is inserted into the No. 2 locking groove 12 of the total locking driving platform 5, and the No. 2 locking column 37 of the No. 2 locking block 2 is pressed into the No. 2 locking hole 36 of the split mold 1, and the installation of this device is completed.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A new type of automobile parts injection mold, characterized by : It comprises a split mold (1), a second locking block (2), a total locking drive platform (5), a first locking block (7), a separation drive block (13), a separation driven block (15), a main body positioning block (18), a driven screw (20), an unlocking screw (23), and a delay plate (27). The main body positioning block (18) has a separation positioning slide bar (32) on its side. The split mold (1) has a separation positioning slide groove (33) on its side. The separation positioning slide groove (33) is adapted to the separation positioning slide bar (32). The separation positioning slide groove (33) is connected to the separation positioning slide bar (32). The separation positioning slide groove (33) slides outside the separation positioning slide bar (32). Four groups of split molds (1) surround the side of the main body positioning block (18) and are connected to each other. The split mold (1) array group The main body positioning block (18) is connected to the main body positioning block (18), and the main body positioning block (18) and the four-group split mold (1) together constitute a semi-injection mold body. The split mold (1) has an expansion driven platform (6) on the top, and a driven block connecting column (17) on the side of the expansion driven platform (6). The separation driven block (15) has a driven block connecting platform (16) on the side, and the bottom of the driven block connecting platform (16) is rotatably connected to the driven block connecting column (17). The top of the separation driven block (15) has an upper claw connecting platform (34). The main body positioning block (18) has a driven screw connecting groove (19) in the middle, and the driven screw connecting groove (19) is adapted to the driven screw (20). The driven screw connecting groove (19) is connected to the driven screw (20), and the driven screw (20) rotates inside the driven screw connecting groove (19).

2. A new type of automobile parts injection mold according to claim 1, characterized in that The driven screw (20) has a screw mounting groove (22) inside, and the bottom of the screw mounting groove (22) has a lower driven slide groove (21), the delay plate (27) is adapted to the screw mounting groove (22), the delay plate (27) is connected to the screw mounting groove (22), the delay plate (27) rotates inside the screw mounting groove (22), the delay plate (27) is placed at the bottom of the screw mounting groove (22), the bottom of the delay plate (27) has a lower delay slider (31), the lower delay slider (31) is adapted to the lower driven slide groove (21), and the lower The delay slider (31) is connected to the lower driven slide groove (21), the lower delay slider (31) slides inside the lower driven slide groove (21), the top of the delay plate (27) is provided with an upper delay slide groove (28), the top of the unlocking screw rod (23) is provided with a screw driving handle (4), the bottom of the unlocking screw rod (23) is provided with a screw mounting block (24), the screw mounting block (24) is adapted to the screw mounting groove (22), the screw mounting block (24) is connected to the screw mounting groove (22), and the screw mounting block (24) rotates inside the screw mounting groove (22).

3. A new type of automobile parts injection mold according to claim 2, characterized in that The screw mounting block (24) is placed on the upper part of the delay plate (27), and the bottom of the screw mounting block (24) is provided with an upper delay slider (26), the upper delay slider (26) is adapted to the upper delay slide groove (28), the upper delay slider (26) is connected to the upper delay slide groove (28), and the upper delay slider (26) slides inside the upper delay slide groove (28), the top of the driven screw (20) is provided with a separation drive screw (29), the separation drive screw (29) surrounds the outside of the unlocking screw (23), the separation drive block (13) is threadedly connected to the separation drive screw (29), the side of the separation drive block (13) is provided with a separation drive claw (14), the end of the separation drive claw (14) is provided with an upper claw connecting block (35), the upper claw connecting platform (34) is rotatably connected to the upper claw connecting block (35), the total locking drive platform (5) is threadedly connected to the unlocking screw (23), and the total locking drive platform (5) has a No. 1 locking platform (9) on both sides.

4. A new type of automobile parts injection mold according to claim 3, characterized in that The surface of the No. 1 locking platform (9) is provided with a No. 1 locking groove (10), the top of the No. 1 locking block (7) is provided with a No. 1 locking slide bar (11), the No. 1 locking slide bar (11) is adapted to the No. 1 locking groove (10), the No. 1 locking slide bar (11) is connected to the No. 1 locking groove (10), the No. 1 locking slide bar (11) slides inside the No. 1 locking groove (10), the top of the No. 1 locking block (7) is connected to the No. 1 locking platform (9) by a spring, the bottom of the No. 1 locking block (7) is provided with a No. 1 locking column (30), the surface of the split mold (1) is provided with a No. 1 locking hole (8) and a No. 2 locking hole (36), the No. 1 locking hole (8) is arranged longitudinally, and the No. 2 locking hole (36) is arranged transversely.

5. A new type of automobile parts injection mold according to claim 4, characterized in that The No. 1 locking column (30) is adapted to the No. 1 locking hole (8), the No. 1 locking column (30) is connected to the No. 1 locking hole (8), the No. 1 locking column (30) is inserted into the No. 1 locking hole (8), the left and right sides of the total locking drive platform (5) are provided with a No. 2 locking platform (25), the surface of the No. 2 locking platform (25) is provided with a No. 2 locking groove (12), the top of the No. 2 locking block (2) is provided with a No. 2 locking slide bar (3), the No. 2 locking slide bar (3) is adapted to the No. 2 locking groove (12), and the No. 2 locking slide bar (3) is connected to the No. 2 locking groove (12).

6. A novel automobile parts injection mold according to claim 1, characterized in that The second locking slide bar (3) slides inside the second locking groove (12), the top of the second locking block (2) is connected to the second locking platform (25) by a spring, the bottom of the second locking block (2) is provided with a second locking column (37), the second locking column (37) is adapted to the second locking hole (36), the second locking column (37) is connected to the second locking hole (36), and the second locking column (37) is inserted into the inside of the second locking hole (36).

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