Turnover cooling bed gap adjusting structure

Abstract

The utility model discloses a gap adjusting structure of a turnover cooling bed, which relates to the field of turnover cooling beds, and comprises a cooling bed support, a fixed tooth-shaped frame and a movable tooth-shaped frame, a driving mechanism is arranged on the side wall of the cooling bed support, the driving mechanism is fixedly connected with a telescopic mechanism, the telescopic mechanism is rotatably connected with a reciprocating mechanism, and the reciprocating mechanism is fixedly connected with the fixed tooth-shaped frame. And a pressing mechanism, a transmission mechanism and a bayonet lock mechanism are arranged in the telescopic mechanism. The telescopic mechanism, the pressing mechanism, the transmission mechanism and the bayonet lock mechanism are arranged, a pressing block in the pressing mechanism is pressed, the pressing mechanism enables a sliding rod in the transmission mechanism to move, the transmission mechanism enables a clamping block in the bayonet lock mechanism to move and leave a clamping groove, a ninth rod and a seventh rod are pulled out, a telescopic rod is made to move, and a third rod and a fourth rod are lengthened; and when the telescopic rod stops moving, the pressing block is loosened, the clamping block is inserted into the other clamping groove, the third rod and the fourth rod are fixed, and the steel cooling gap is adjusted.

Description

Technical Field

[0001] The utility model relates to the field of tilting cooling beds, in particular to a gap adjusting structure for a tilting cooling bed. Background Art

[0002] A cooling bed is a working surface for effectively cooling rolled products (such as deformed steel bars, steel pipes, etc.) in the metallurgical rolling industry. The cooling bed consists of a mechanical drive system, a water cooling system, a cooling bed working surface, a fixed bracket, etc. The tilting cooling bed can make the billets run one by one, and each billet is flipped by an angle every time it moves forward by one step. In this way, the billets can be cooled evenly on all four sides and maintain good straightness, and it is used for the collection of long billets.

[0003] In the prior art, the gap between steel materials is determined by the distance between the teeth of a fixed toothed rack. According to the requirements such as the thickness of the steel materials, different cooling times are required, and different intervals are also required. This requires changing the machine or adjusting the motor speed, which reduces the working efficiency, and there is still room for further improvement in improving the cooling efficiency. Based on this, in order to facilitate the adjustment of the gap of the tilting cooling bed, a gap adjusting structure for a tilting cooling bed is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a gap adjusting structure for a tilting cooling bed in order to solve the problem of inconvenient adjustment of the gap of the tilting cooling bed.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A gap adjusting structure for a tilting cooling bed, including a cooling bed bracket fixed to the ground, a fixed toothed rack is fixedly connected to the upper end of the cooling bed bracket, a driving mechanism is arranged on the side wall of the cooling bed bracket, the driving mechanism is fixedly connected with a telescopic mechanism, the telescopic mechanism is rotatably connected with a reciprocating mechanism, the reciprocating mechanism is fixedly connected with a movable toothed rack, a pressing mechanism, a transmission mechanism and a pin mechanism are arranged in the telescopic mechanism, the pressing mechanism is in contact with the transmission mechanism, and the transmission mechanism is in contact with the pin mechanism;

[0006] The driving mechanism in the starting state is used to drive the telescopic mechanism to rotate;

[0007] The telescopic mechanism in the telescopic state is used to adjust the gap of the movable toothed rack to move, and the telescopic mechanism is used to make the reciprocating mechanism operate;

[0008] The reciprocating mechanism in the operating state is used to make the movable toothed rack perform a reciprocating motion;

[0009] The pressing mechanism in the pressing state is used to provide power for the transmission mechanism;

[0010] The transmission mechanism in the transmission state is used to transmit the power of the pressing mechanism to the pin mechanism;

[0011] The pin mechanism in the pin state is used to fix the telescopic mechanism, and the pin mechanism in the non-pin state enables the telescopic mechanism to expand and contract.

[0012] As a further solution of the present utility model: The driving mechanism includes a motor and a rotating shaft;

[0013] The motor is installed on one side of the "V" type frame of the cooling bed bracket, the rotating shaft is fixedly connected to the output end of the motor, and the rotating shaft penetrates to the other side of the "V" type frame of the cooling bed bracket and is rotatably connected to the cooling bed bracket.

[0014] As a further solution of the present utility model: The reciprocating mechanism includes a first rod, a first long rotating shaft, a second long rotating shaft, a connecting shaft, a second rod, an L-shaped rod and a fifth rod;

[0015] The upper end of the second rod is fixedly connected to the bottom of the movable toothed frame, and the lower end of the second rod and the middle end of the L-shaped rod are rotatably connected through the connecting shaft. The upper end of the L-shaped rod and the lower end of the fifth rod are rotatably connected through the second long rotating shaft, and the lower end of the L-shaped rod and one end of the first rod are rotatably connected through the first long rotating shaft. The upper end of the fifth rod and the side wall of the cooling bed bracket are rotatably connected through the connecting shaft.

[0016] As a further solution of the present utility model: The telescopic mechanism includes a third rod, a fourth rod and a telescopic rod;

[0017] The third rod includes an eighth rod and a ninth rod;

[0018] The fourth rod includes a sixth rod and a seventh rod;

[0019] One end of the sixth rod is fixedly connected to the outer wall of the second long rotating shaft. The seventh rod and the ninth rod are rotatably connected through the connecting shaft. The eighth rod is fixedly connected to the outer wall of the rotating shaft. The two telescopic rods are respectively fixedly connected to one end of the seventh rod close to the sixth rod and one end of the ninth rod close to the eighth rod, and the telescopic rods slide inside the sixth rod and the eighth rod.

[0020] As a further solution of the present utility model: The pressing mechanism includes a pressing block, a slider and a first spring;

[0021] There is a set of pressing mechanisms in each of the third rod and the fourth rod;

[0022] One end of the pressing block slides inside the seventh rod, and the other end of the pressing block penetrates to the side wall of the seventh rod. A first inclined surface is formed at one end of the pressing block. The slider is fixedly connected to the side wall of the pressing block. The two ends of the first spring are fixedly connected to one side of the slider and the inside of the seventh rod.

[0023] As a further solution of the present utility model: The transmission mechanism includes a slide rod and a third spring;

[0024] There is a set of transmission mechanism in each of the third rod and the fourth rod;

[0025] The slide rod slides inside the seventh rod and the telescopic rod, and a second inclined surface is formed at the contact position between one end of the slide rod and the first inclined surface, and two third inclined surfaces are formed at the other end of the slide rod. Both ends of the third spring are fixedly connected to the other end of the slide rod and the inside of the telescopic rod.

[0026] As a further solution of the present utility model: The pin mechanism includes a card slot, a card block and a second spring;

[0027] There is a set of pin mechanism in each of the third rod and the fourth rod;

[0028] Four of the card slots are respectively opened at the upper and lower ends of the inner cavity of the sixth rod. One end of two of the card blocks slides inside the telescopic rod, and the other end of the two card blocks penetrates to both sides of the telescopic rod. The card blocks are inserted into the card slots, and a fourth inclined surface is formed at the contact position between one end of the card block and the third inclined surface. Both ends of the second spring are respectively fixedly connected to one end of the card block and the inside of the telescopic rod.

[0029] Compared with the prior art, the beneficial effects of the present utility model are: By setting a telescopic mechanism, a pressing mechanism, a transmission mechanism and a pin mechanism, pressing the pressing block in the pressing mechanism, the pressing mechanism moves the slide rod in the transmission mechanism, and the transmission mechanism moves the card block in the pin mechanism away from the card slot, pulls out the ninth rod and the seventh rod, moves the telescopic rod, lengthens the third rod and the fourth rod. When the telescopic rod stops moving, release the pressing block, and the card block is inserted into another card slot to fix the third rod and the fourth rod, realizing the adjustment of the cooling gap of the steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the present utility model;

[0031] Figure 2 It is a schematic structural diagram of the driving mechanism, the reciprocating mechanism and the telescopic mechanism of the present utility model;

[0032] Figure 3 It is a schematic structural diagram of the reciprocating mechanism and the telescopic mechanism of the present utility model;

[0033] Figure 4 It is a schematic structural diagram of the driving mechanism and the telescopic mechanism of the present utility model;

[0034] Figure 5 It is a sectional view of the third rod of the present utility model;

[0035] Figure 6 This is the sectional view of the fourth rod of the present utility model;

[0036] Figure 7 This is the schematic structural diagram of the pressing mechanism, transmission mechanism and pin mechanism of the present utility model;

[0037] Figure 8 This is the schematic structural diagram of the transmission mechanism and pin mechanism of the present utility model.

[0038] In the figure: 1, cooling bed support; 2, fixed toothed frame; 3, movable toothed frame; 4, motor; 5, rotating shaft; 6, first rod; 7, first long rotating shaft; 8, second long rotating shaft; 9, connecting shaft; 10, second rod; 11, third rod; 12, fourth rod; 13, L-shaped rod; 14, fifth rod; 15, sixth rod; 16, seventh rod; 17, eighth rod; 18, ninth rod; 19, pressing block; 20, slider; 21, first spring; 22, sliding rod; 23, card slot; 24, telescopic rod; 25, clamping block; 26, second spring; 27, third spring. Specific embodiments

[0039] 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.

[0040] Please refer to Figures 1 to 8 , in the embodiment of the present utility model, a gap adjustment structure for a flipping cooling bed includes a cooling bed support 1 fixed to the ground. A fixed toothed frame 2 is fixedly connected to the upper end of the cooling bed support 1. A driving mechanism is arranged on the side wall of the cooling bed support 1. The driving mechanism is fixedly connected to a telescopic mechanism. The telescopic mechanism is rotatably connected to a reciprocating mechanism. The reciprocating mechanism is fixedly connected to a movable toothed frame 3. A pressing mechanism, a transmission mechanism and a pin mechanism are arranged in the telescopic mechanism. The pressing mechanism contacts the transmission mechanism, and the transmission mechanism contacts the pin mechanism;

[0041] The driving mechanism in the starting state is used to drive the telescopic mechanism to rotate;

[0042] The telescopic mechanism in the telescopic state is used to adjust the gap of the movement of the movable toothed frame 3, and the telescopic mechanism is used to make the reciprocating mechanism operate;

[0043] The reciprocating mechanism in the operating state is used to make the movable toothed frame 3 perform reciprocating motion;

[0044] The pressing mechanism in the pressing state is used to provide power to the transmission mechanism;

[0045] The transmission mechanism in the transmission state is used to transmit the power of the pressing mechanism to the locking pin mechanism;

[0046] The locking pin mechanism in the locking pin state is used to fix the telescopic mechanism, and the locking pin mechanism in the non-locking pin state enables the telescopic mechanism to expand and contract.

[0047] In this embodiment: When it is necessary to adjust the cooling gap of the steel, press the pressing block 19 in the pressing mechanism. The pressing block 19 drives the slider 20 to move towards the first spring 21, squeezing the first spring 21. At the same time, the first inclined surface and the second inclined surface are squeezed, and the squeezing force causes the sliding rod 22 in the transmission mechanism to move towards the third spring 27, squeezing the third spring 27. At the same time, the third inclined surface and the fourth inclined surface are squeezed, and the squeezing force causes the locking block 25 in the locking pin mechanism to move towards the second spring 26, leaving the card slot 23, squeezing the second spring 26, pulling out the ninth rod 18 and the seventh rod 16, moving the telescopic rod 24, lengthening the third rod 11 and the fourth rod 12. When the telescopic rod 24 stops moving, release the pressing block 19, and the locking block 25 is inserted into another card slot 23 to fix the third rod 11 and the fourth rod 12. At this time, the movable toothed rack 3 makes a reciprocating motion, so that the gap of the steel on the fixed toothed rack 2 changes from the distance of one tooth block to the distance of two tooth blocks, realizing the adjustment of the steel cooling gap.

[0048] Please refer specifically to Figures 1 to 2 Figure 4, the driving mechanism includes a motor 4 and a rotating shaft 5;

[0049] The motor 4 is installed on one side of the "V" type frame of the cooling bed bracket 1. The rotating shaft 5 is fixedly connected to the output end of the motor 4, and the rotating shaft 5 penetrates to the other side of the "V" type frame of the cooling bed bracket 1 and is rotatably connected to the cooling bed bracket 1.

[0050] In this embodiment: When it is necessary for the telescopic mechanism to rotate, start the motor 4. The motor 4 drives the rotating shaft 5 to rotate through the output end, and the rotation of the rotating shaft 5 drives the third rod 11 to rotate, realizing the driving mechanism in the starting state to drive the telescopic mechanism to rotate.

[0051] Please refer specifically to Figures 1 to 3 Figure 5, the reciprocating mechanism includes a first rod 6, a first long rotating shaft 7, a second long rotating shaft 8, a connecting shaft 9, a second rod 10, an L-shaped rod 13 and a fifth rod 14;

[0052] The upper end of the second rod 10 is fixedly connected to the bottom of the movable toothed rack 3, and the lower end of the second rod 10 and the middle end of the L-shaped rod 13 are rotatably connected through the connecting shaft 9. The upper end of the L-shaped rod 13 and the lower end of the fifth rod 14 are rotatably connected through the second long rotating shaft 8, and the lower end of the L-shaped rod 13 and one end of the first rod 6 are rotatably connected through the first long rotating shaft 7. The upper end of the fifth rod 14 and the side wall of the cooling bed bracket 1 are rotatably connected through the connecting shaft 9.

[0053] In this embodiment: When the movable toothed frame 3 needs to move, the driving mechanism is started. Through the driving mechanism and the transmission mechanism, the second long rotating shaft 8 moves. The movement of the second long rotating shaft 8 drives the L-shaped rod 13 and the fifth rod 14 to move. The fifth rod 14 rotates around the cooling bed bracket 1 through a connecting shaft 9. The L-shaped rod 13 makes the first rod 6 move through the first long rotating shaft 7, and the L-shaped rod 13 makes the second rod 10 move through another connecting shaft 9. The second rod 10 drives the movable toothed frame 3 to move, and the reciprocating mechanism in the operating state makes the movable toothed frame 3 perform reciprocating motion.

[0054] Please refer specifically to Figures 1 to 8 , the telescopic mechanism includes a third rod 11, a fourth rod 12 and a telescopic rod 24;

[0055] The third rod 11 includes an eighth rod 17 and a ninth rod 18;

[0056] The fourth rod 12 includes a sixth rod 15 and a seventh rod 16;

[0057] One end of the sixth rod 15 is fixedly connected to the outer wall of the second long rotating shaft 8. The seventh rod 16 and the ninth rod 18 are rotationally connected through a connecting shaft 9. The eighth rod 17 is fixedly connected to the outer wall of the rotating shaft 5. Two telescopic rods 24 are respectively fixedly connected to one end of the seventh rod 16 near the sixth rod 15 and one end of the ninth rod 18 near the eighth rod 17, and the telescopic rods 24 slide inside the sixth rod 15 and the eighth rod 17.

[0058] In this embodiment: When it is necessary to lengthen the third rod 11 and the fourth rod 12, the pressing mechanism and the transmission mechanism are used to release the limit of the pin mechanism, pull out the ninth rod 18 and the seventh rod 16, move the telescopic rod 24, lengthen the third rod 11 and the fourth rod 12. When the telescopic rod 24 stops moving, release the pressing mechanism, and the pin mechanism re-limits to fix the third rod 11 and the fourth rod 12. The movement of the fourth rod 12 drives the second long rotating shaft 8 to move, realizing that the telescopic mechanism in the telescopic state adjusts the gap of the movement of the movable toothed frame 3, and the telescopic mechanism makes the reciprocating mechanism operate.

[0059] Please refer specifically to Figures 4 to 7 , the pressing mechanism includes a pressing block 19, a slider 20 and a first spring 21;

[0060] There is a set of pressing mechanisms in each of the third rod 11 and the fourth rod 12;

[0061] One end of the pressing block 19 slides inside the seventh rod 16, and the other end of the pressing block 19 penetrates through the side wall of the seventh rod 16. A first inclined surface is formed at one end of the pressing block 19. The slider 20 is fixedly connected to the side wall of the pressing block 19. Both ends of the first spring 21 are fixedly connected to one side of the slider 20 and the inside of the seventh rod 16.

[0062] In this embodiment: When the transmission mechanism needs to move, press the pressing block 19. The pressing block 19 drives the slider 20 to move towards the first spring 21. During the movement, the first spring 21 is compressed, and at the same time, the first inclined surface and the second inclined surface are squeezed. The squeezing force causes the sliding rod 22 in the transmission mechanism to move, realizing that the pressing mechanism in the pressed state provides power to the transmission mechanism.

[0063] Please refer specifically to Figures 5 to 8 , the transmission mechanism includes a sliding rod 22 and a third spring 27;

[0064] There is a set of transmission mechanism in each of the third rod 11 and the fourth rod 12;

[0065] The sliding rod 22 slides inside the seventh rod 16 and the telescopic rod 24. One end of the sliding rod 22 is formed with a second inclined surface at the contact position with the first inclined surface, and the other end of the sliding rod 22 is formed with two third inclined surfaces. Both ends of the third spring 27 are fixedly connected to the other end of the sliding rod 22 and the inside of the telescopic rod 24.

[0066] In this embodiment: When the pin mechanism needs to release the limit, press the pressing block 19 in the pressing mechanism. The first inclined surface of the pressing mechanism and the second inclined surface of the transmission mechanism are squeezed. The squeezing force causes the sliding rod 22 to move towards the third spring 27. During the movement, the third spring 27 is compressed, and at the same time, the third inclined surface and the fourth inclined surface are squeezed. The squeezing force causes the locking block 25 in the pin mechanism to leave the card slot 23, realizing that the transmission mechanism in the transmission state transmits the power of the pressing mechanism to the pin mechanism to release the limit of the pin mechanism.

[0067] Please refer specifically to Figures 5 to 6 , 8. The pin mechanism includes a card slot 23, a locking block 25 and a second spring 26;

[0068] There is a set of pin mechanism in each of the third rod 11 and the fourth rod 12;

[0069] Four card slots 23 are respectively opened at the upper and lower ends of the inner cavity of the sixth rod 15. One end of two locking blocks 25 slides inside the telescopic rod 24, and the other end of the two locking blocks 25 penetrates to both sides of the telescopic rod 24. The locking block 25 is inserted into the card slot 23, and a fourth inclined surface is formed at the contact position of one end of the locking block 25 with the third inclined surface. Both ends of the second spring 26 are fixedly connected to one end of the locking block 25 and the inside of the telescopic rod 24.

[0070] In this embodiment: When the telescopic rod 24 needs to move, through the pressing mechanism and the transmission mechanism, the third inclined surface of the transmission mechanism and the fourth inclined surface of the pin mechanism are engaged. The squeezing force causes the locking block 25 to move towards the second spring 26. During the movement, the second spring 26 is compressed, and the locking block 25 is made to leave the card slot 23. At this time, the telescopic rod 24 can be moved, realizing that the pin mechanism in the pin state fixes the telescopic mechanism, and the pin mechanism in the non-pin state enables the telescopic mechanism to expand and contract.

[0071] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A turning cooling bed gap adjustment structure, comprising a cooling bed support (1) fixed to the ground, wherein the upper end of the cooling bed support (1) is fixedly connected to a fixed tooth frame (2), and the side wall of the cooling bed support (1) is provided with a driving mechanism, characterized in that: The driving mechanism is fixedly connected to a telescopic mechanism, the telescopic mechanism is rotatably connected to a reciprocating mechanism, the reciprocating mechanism is fixedly connected to a movable toothed frame (3), a pressing mechanism, a transmission mechanism, and a bayonet mechanism are arranged in the telescopic mechanism, the pressing mechanism is in contact with the transmission mechanism, and the transmission mechanism is in contact with the bayonet mechanism; The driving mechanism in the started state is used to drive the telescopic mechanism to rotate; The telescopic mechanism in the telescopic state is used to adjust the clearance of the movable toothed frame (3) and the telescopic mechanism is used to enable the reciprocating mechanism to operate; The reciprocating mechanism in the operating state is used to make the movable toothed frame (3) perform reciprocating motion; The pressing mechanism in the pressing state is used to provide power to the transmission mechanism; The transmission mechanism in the transmission state is used to transmit the power of the pressing mechanism to the bayonet mechanism; The bayonet mechanism in the bayonet state is used to fix the telescopic mechanism, and the bayonet mechanism in the non-bayonet state enables the telescopic mechanism to be telescoped.

2. The gap adjustment structure of the turning cooling bed according to claim 1 is characterized in that: The driving mechanism comprises a motor (4) and a rotating shaft (5); The motor (4) is mounted on one side of the "V"-shaped frame of the cooling bed support (1), the rotating shaft (5) is fixedly connected to the output end of the motor (4), and the rotating shaft (5) passes through the other side of the "V"-shaped frame of the cooling bed support (1) and is rotatably connected to the cooling bed support (1).

3. The gap adjustment structure of the turning cooling bed according to claim 2 is characterized in that: The reciprocating mechanism comprises a first rod (6), a first long rotating shaft (7), a second long rotating shaft (8), a connecting shaft (9), a second rod (10), an L-shaped rod (13) and a fifth rod (14); The upper end of the No. 2 rod (10) is fixedly connected to the bottom of the movable toothed frame (3), and the lower end of the No. 2 rod (10) and the middle end of the L-shaped rod (13) are rotationally connected via the connecting shaft (9), the upper end of the L-shaped rod (13) and the lower end of the No. 5 rod (14) are rotationally connected via the No. 2 long rotating shaft (8), and the lower end of the L-shaped rod (13) and one end of the No. 1 rod (6) are rotationally connected via the No. 1 long rotating shaft (7), and the upper end of the No. 5 rod (14) and the side wall of the cooling bed support (1) are rotationally connected via the connecting shaft (9).

4. The gap adjustment structure of the turning cooling bed according to claim 3 is characterized in that: The telescopic mechanism comprises a third rod (11), a fourth rod (12) and a telescopic rod (24); The No. 3 rod (11) includes a No. 8 rod (17) and a No. 9 rod (18); The fourth rod (12) includes a sixth rod (15) and a seventh rod (16); One end of the No. 6 rod (15) is fixedly connected to the outer wall of the No. 2 long rotating shaft (8); the No. 7 rod (16) and the No. 9 rod (18) are rotatably connected via the connecting shaft (9); the No. 8 rod (17) is fixedly connected to the outer wall of the rotating shaft (5); two telescopic rods (24) are respectively fixedly connected to the No. 7 rod (16), one end of the No. 6 rod (15) and one end of the No. 9 rod (18) close to the No. 8 rod (17); and the telescopic rods (24) slide inside the No. 6 rod (15) and the No. 8 rod (17).

5. The gap adjustment structure of the turning cooling bed according to claim 4 is characterized in that: The pressing mechanism comprises a pressing block (19), a sliding block (20) and a spring (21); The third rod (11) and the fourth rod (12) each have a set of pressing mechanisms inside; One end of the pressing block (19) slides inside the No. 7 rod (16), and the other end of the pressing block (19) penetrates the side wall of the No. 7 rod (16), and one end of the pressing block (19) is formed with a first inclined surface, the sliding block (20) is fixedly connected to the side wall of the pressing block (19), and the two ends of the No. 1 spring (21) are fixedly connected to one side of the sliding block (20) and the inside of the No. 7 rod (16).

6. The gap adjustment structure of the turning cooling bed according to claim 5 is characterized in that: The transmission mechanism comprises a slide bar (22) and a third spring (27); The third rod (11) and the fourth rod (12) each have a transmission mechanism therein; The slide bar (22) slides inside the seventh rod (16) and the telescopic rod (24), and a second inclined surface is formed at a position where one end of the slide bar (22) contacts the first inclined surface, and two third inclined surfaces are formed at the other end of the slide bar (22), and two ends of the third spring (27) are fixedly connected to the other end of the slide bar (22) and the inside of the telescopic rod (24).

7. The gap adjustment structure of the turning cooling bed according to claim 6 is characterized in that: The latch mechanism comprises a latch slot (23), a latch block (25) and a second spring (26); The third rod (11) and the fourth rod (12) each have a set of bayonet mechanisms; The four card slots (23) are respectively provided with upper and lower ends of the inner cavity of the No. 6 rod (15); one end of the two card blocks (25) slides inside the telescopic rod (24); the other ends of the two card blocks (25) penetrate through both sides of the telescopic rod (24); the card blocks (25) are plugged into the card slots (23); a fourth inclined surface is formed at a position where one end of the card block (25) contacts the third inclined surface; and two ends of the No. 2 spring (26) are respectively fixedly connected to one end of the card block (25) and the inside of the telescopic rod (24).

Images