Marine transformer with protection mechanism

Abstract

The invention relates to the field of marine transformers, and discloses a marine transformer with a protection mechanism, the marine transformer comprises a transformer oil tank and a mounting seat, the transformer oil tank is arranged above the mounting seat, a movable supporting structure is arranged in the middle of the upper surface of the mounting seat, and the transformer oil tank is arranged on the mounting seat through an external protection structure; a mounting frame is fastened in the middle of the lower inner wall of the transformer oil tank, a winding is mounted on the mounting frame, and oil sliding up and down in the transformer oil tank can be blocked through an internal protection structure when the ship body shakes up and down to drive the oil to slide, so that the upper side face and the lower side face of the transformer oil tank are protected; the problem that the upper side face and the lower side face of the transformer oil tank deform due to impact is reduced, the upper side face and the lower side face of the transformer oil tank can be protected outside the transformer oil tank through the external protection structure and the auxiliary protection structure, and the protection effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of marine transformers, in particular to a marine transformer with a protection mechanism. Background Art

[0002] ‌Marine transformer‌ is a kind of electrical equipment specially designed for ships. It is mainly used to adjust the voltage generated by the ship's generator to a voltage suitable for various electrical equipment on board. Marine transformers are resistant to moisture and heat, salt spray, mildew, impact, vibration, tilt, and swing, and are usually designed as a sealed structure to adapt to the ship environment.‌ In the prior art, when the ship hull is affected by wind and waves and then tilts, the transformer oil tank can be driven to tilt synchronously, and the transformer oil inside the transformer oil tank flows along the tilting direction of the transformer oil tank. At this time, the blocking component is driven by the sliding component to move in the direction opposite to the tilting direction of the transformer oil tank. When the blocking component moves, it can push the flowing transformer oil, thereby reducing the impact of the transformer oil on the inner wall of the transformer oil tank, and avoiding the transformer oil from impacting the transformer oil tank too much, thereby causing deformation and damage to the transformer oil tank. However, when the hull is traveling on the water, not only will it tilt left and right, but the oil in the transformer tank will impact the inner wall of the transformer tank, and the hull will slide up and down on the water as the water surface rises and falls. In this way, the oil in the transformer tank will slide up and down, impacting the upper and lower inner walls of the transformer tank, especially the lower inner wall of the transformer tank, which is easily deformed. Therefore, there is room for improvement. Summary of the invention

[0003] In order to solve the problems raised in the above background technology, the present invention provides a marine transformer with a protection mechanism.

[0004] The present invention provides a marine transformer with a protective mechanism, which adopts the following technical solution: A marine transformer with a protective mechanism comprises a transformer oil tank and a mounting seat, wherein the transformer oil tank is arranged above the mounting seat, a movable support structure is arranged in the middle of the upper part of the mounting seat, the transformer oil tank is arranged on the mounting seat through an external protective structure, a mounting frame is fastened in the middle of the lower inner wall of the transformer oil tank, a winding is installed on the mounting frame, an internal protective structure is arranged at the upper and lower inner walls of the transformer oil tank, and a side protective structure is arranged at the left and right sides of the lower inner wall of the transformer oil tank; The internal protection structure includes a fixing strip fixedly installed in the middle of the upper and lower inner walls of the transformer oil tank, the fixing strip is provided with a first groove at positions close to both ends, a first fixing rod is connected between the groove walls at both ends of each of the first grooves, a first moving block is movably sleeved at one end of the first fixing rod, the first moving block is slidably arranged in the first groove, a first spring is sleeved on the first fixing rod, the two ends of the first spring are respectively connected to the first moving block and the groove wall at one end of the first groove, the top end of the first moving block is rotatably connected to the first curved plate, one end of the first curved plate is rotatably connected to the mounting plate, a plurality of first protective plates are equidistantly installed on a side surface of the mounting plate away from the fixing strip, and a side surface of the first protective plate close to the winding is a concave arc surface.

[0005] Preferably, the external protective structure includes fixed blocks fixedly arranged at four corners on the mounting seat, the fixed block is in a "cross" shape, a vertical rod is connected to the middle of the upper part of the fixed block, a sleeve is movably sleeved on the vertical rod, a welding disk is fastened on the top of the sleeve by bolts, the welding disk is welded to the transformer oil tank, a second spring is sleeved on the vertical rod, two ends of the second spring are respectively connected to the fixed block and the bottom end of the sleeve, and an auxiliary protective structure is provided on the fixed block.

[0006] Preferably, the auxiliary protection structure includes four second grooves opened on the fixed block, a second movable block is slidably arranged at the groove wall of the second groove close to one end of the sleeve, a first T-shaped rod that movably passes through the fixed block is connected to one side surface of the second movable block, a third spring is sleeved on the first T-shaped rod, two ends of the third spring are respectively connected to one end of the first T-shaped rod and the outer side surface of the fixed block, the top end of the second movable block is rotatably connected to a second curved plate, and the top end of the second curved plate is rotatably connected to the welding disk.

[0007] Preferably, the movable support structure includes a fixed frame fixedly installed in the middle of the mounting seat, a third groove is provided at the lower part of the inner walls on the front and rear sides of the fixed frame, a third movable block is slidably arranged in the third groove, a fourth groove is provided at the upper part of the inner walls on the left and right sides of the fixed frame, a fourth movable block is slidably arranged in the fourth groove, sliding rods are respectively connected between the two fourth movable blocks and between the two third movable blocks, a movable seat is movably sleeved on the two sliding rods, and a support plate is installed in the middle of the upper part of the movable seat.

[0008] Preferably, the side protection structure includes a switching seat rotatably installed on the lower inner wall of the transformer oil tank near four corners, a gear is fixed on the bottom end of the switching seat, a second protective plate is installed on the top of the switching seat, one side of the second protective plate is a concave arc surface, and the switching structure is provided on both sides of the lower inner wall of the transformer oil tank.

[0009] Preferably, the switching structure includes two horizontal plates installed on the left and right sides of the lower inner wall of the transformer oil tank, guide grooves are provided in the middle of the front and rear side surfaces of the horizontal plates, a slide is provided on the guide groove, a gravity block is installed in the middle of the upper part of the slide, driving strips are connected to the front and rear edges under the slide, the driving strips are provided with teeth meshing with gears, and a limiting structure is provided on the horizontal plate.

[0010] Preferably, the limiting structure is provided with limiting blocks at the positions near the two ends in the guide groove, a through hole is opened in the middle of the limiting block, the left and right side surfaces of the slide seat are connected with second fixing rods at the positions in the guide groove, second T-shaped rods are movably passed through the groove walls at the left and right ends of the guide groove, a fourth spring is sleeved on the second T-shaped rod, the two ends of the fourth spring are respectively connected to one end of the second T-shaped rod and the cross plate, and a pushing block is installed on the end of the second T-shaped rod inserted into the guide groove.

[0011] In summary, the present invention includes the following beneficial technical effects: The present invention is provided with an internal protection structure, an external protection structure and an auxiliary protection structure. The internal protection structure can block the oil sliding up and down in the transformer oil tank when the hull shakes up and down to drive the oil to slide, thereby protecting the upper and lower sides of the transformer oil tank, reducing the problem of deformation of the upper and lower sides of the transformer oil tank caused by impact, and the upper and lower sides of the transformer oil tank can be protected outside the transformer oil tank through the external protection structure and the auxiliary protection structure, so that the protection effect is better. The present invention is provided with a movable support structure, so that when the hull is swaying and tilting and the center of gravity of the transformer oil tank is low, the support plate on the movable support structure moves to a corresponding position, and provides auxiliary support under the transformer oil tank, so as to avoid the situation that the connection between the transformer oil tank and the mounting seat is broken due to excessive swaying force, thereby improving the firmness of the installation; The present invention is provided with a side protection structure and a switching structure. When the hull tilts left or right, the switching structure can drive the second protection plate on the side protection structure to rotate, thereby switching the concave arc surface on the second protection plate to a position in the opposite direction of the hull tilt, and correspondingly blocking the oil sliding in the transformer oil tank, thereby protecting the inner wall of the transformer oil tank, making the protection work more comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a marine transformer with a protection mechanism in an embodiment of the present invention; Figure 2 is a schematic structural diagram of a mounting seat in an embodiment of the present invention; Figure 3 In the embodiment of the present invention Figure 2 A magnified view of the structure at A; Figure 4 is a schematic structural diagram of a fixed frame in an embodiment of the present invention; Figure 5 is a schematic structural diagram of a transformer oil tank in an embodiment of the present invention; Figure 6 is a schematic diagram of the structure inside the transformer oil tank in an embodiment of the present invention; Figure 7 is a schematic diagram of the structure of the switching structure in an embodiment of the present invention; Figure 8 It is a structural schematic diagram of the internal protection structure in an embodiment of the present invention.

[0013] Description of reference numerals: 1, transformer oil tank; 2, mounting seat; 3, fixing bar; 4, first groove; 5, first moving block; 6, first curved plate; 7, mounting plate; 8, first fixing rod; 9, first spring; 10, first protective plate; 11, bushing; 12, second spring; 13, welding plate; 14, fixing block; 15, second curved plate; 16, second groove; 17, second moving block; 18, first T-shaped rod; 19, third spring; 20, fixing frame; 21, third groove slot; 22, third moving block; 23, fourth groove; 24, fourth moving block; 25, slide bar; 26, moving seat; 27, support plate; 28, switching seat; 29, second protective plate; 30, gear; 31, mounting frame; 32, winding; 33, cross plate; 34, guide slot; 35, slide seat; 36, gravity block; 37, driving strip; 38, limit block; 39, through hole; 40, second fixing rod; 41, push block; 42, second T-shaped rod; 43, fourth spring. DETAILED DESCRIPTION

[0014] The following is combined with Figure 1-Figure 8 The present invention is described in further detail.

[0015] The embodiment of the present invention discloses a marine transformer with a protective mechanism, comprising a transformer oil tank 1 and a mounting seat 2, wherein the transformer oil tank 1 is arranged above the mounting seat 2, a movable support structure is arranged in the middle of the upper part of the mounting seat 2, the transformer oil tank 1 is arranged on the mounting seat 2 through an external protective structure, a mounting frame 31 is fastened in the middle of the lower inner wall of the transformer oil tank 1, a winding 32 is installed on the mounting frame 31, an internal protective structure is arranged at the upper and lower inner walls of the transformer oil tank 1, and a side protective structure is arranged at the left and right sides of the lower inner wall of the transformer oil tank 1; The internal protection structure includes a fixing strip 3 fixedly installed in the middle of the inner walls of the upper and lower sides of the transformer oil tank 1, and a first groove 4 is opened at a position close to both ends of the fixing strip 3. A first fixing rod 8 is connected between the groove walls at both ends of each first groove 4, and a first moving block 5 is movably sleeved at one end of the first fixing rod 8. The first moving block 5 is slidably arranged in the first groove 4. A first spring 9 is sleeved on the first fixing rod 8, and the two ends of the first spring 9 are respectively connected to the first moving block 5 and the groove wall at one end of the first groove 4. The top end of the first moving block 5 is rotatably connected to the first curved plate 6, and one end of the first curved plate 6 is rotatably connected to the mounting plate 7. The installation A plurality of first protective plates 10 are installed at equal intervals on one side of the plate 7 away from the fixing bar 3. The side of the first protective plate 10 close to the winding 32 is a concave arc surface. When the hull rocks up and down while traveling on the water, driving the oil in the transformer oil tank 1 to rock up and down, the plurality of first protective plates 10 at the upper and lower inner walls of the transformer oil tank 1 are used to block the flow, and the first protective plate 10 drives the first moving block 5 at one end of the first curved plate 6 to move in the first groove 4, driving the deformation of the first spring 9, so as to buffer and protect the oil, reduce the impact of the oil on the upper and lower inner walls of the transformer oil tank 1, and cause the upper and lower sides of the transformer oil tank 1 to deform.

[0016] See also Figure 1-Figure 3 The external protection structure includes a fixed block 14 fixedly arranged at the four corners of the mounting seat 2, the fixed block 14 is in a "cross" shape, and a vertical rod is connected to the middle of the upper part of the fixed block 14, and a sleeve 11 is movably sleeved on the vertical rod. A welding plate 13 is fastened on the top of the sleeve 11 by bolts, and the welding plate 13 is welded to the transformer oil tank 1. A second spring 12 is sleeved on the vertical rod, and the two ends of the second spring 12 are respectively connected to the fixed block 14 and the bottom end of the sleeve 11. An auxiliary protection structure is provided on the fixed block 14. When the hull slides up and down, outside the transformer oil tank 1, the sleeve 11 is driven to move up and down on the vertical rod to drive the second spring 12 to deform, thereby performing buffer protection on the outside of the transformer oil tank 1, and further improving the protection effect on the upper and lower sides of the transformer oil tank 1; The auxiliary protection structure includes four second grooves 16 opened on the fixed block 14, and a second movable block 17 is slidably arranged at the groove wall of the second groove 16 near one end of the sleeve 11. A first T-shaped rod 18 that movably passes through the fixed block 14 is connected to one side surface of the second movable block 17, and a third spring 19 is sleeved on the first T-shaped rod 18. The two ends of the third spring 19 are respectively connected to one end of the first T-shaped rod 18 and the outer side surface of the fixed block 14. The top end of the second movable block 17 is rotatably connected to the second curved plate 15, and the top end of the second curved plate 15 is rotatably connected to the welding disk 13. When the sleeve 11 moves on the vertical rod, the second movable block 17 and the first T-shaped rod 18 are driven by the second curved plate 15 to move as a whole on the fixed block 14, and the third spring 19 is driven to deform, thereby converting part of the vertical impact force into lateral buffering protection, and the protection quality is higher.

[0017] See also Figure 2 and Figure 4 The mobile support structure includes a fixed frame 20 fixedly mounted in the middle of the mounting seat 2, a third groove 21 is provided at the lower part of the inner walls on both sides of the front and rear of the fixed frame 20, a third moving block 22 is slidably arranged in the third groove 21, a fourth groove 23 is provided at the upper part of the inner walls on both sides of the left and right of the fixed frame 20, a fourth moving block 24 is slidably arranged in the fourth groove 23, a sliding rod 25 is connected between the two fourth moving blocks 24 and between the two third moving blocks 22, a moving seat 26 is movably sleeved on the two sliding rods 25, and a support plate 27 is installed in the middle part of the upper part of the moving seat 26. When the hull tilts, the center of gravity of the transformer oil tank 1 shifts. At this time, the movement of the moving seat 26 on the fixed frame 20 drives the support plate 27 to move to the corresponding position under the transformer oil tank 1 to perform auxiliary support work, thereby reducing the problem of vertical rod breaking due to excessive shaking force, and improving the installation firmness of the transformer oil tank 1 on the mounting seat 2.

[0018] See also Figure 1 The side protection structure includes a switching seat 28 rotatably mounted on the lower inner wall of the transformer oil tank 1 near the four corners, a gear 30 is fixedly sleeved on the bottom end of the switching seat 28, a second protection plate 29 is mounted on the top of the switching seat 28, and one side of the second protection plate 29 is a concave arc surface, and the left and right sides of the lower inner wall of the transformer oil tank 1 are provided with a switching structure; The switching structure includes two horizontal plates 33 installed on the left and right sides of the lower inner wall of the transformer oil tank 1. A guide groove 34 is provided in the middle of the front and rear sides of the horizontal plate 33. A slide 35 is sleeved on the guide groove 34. A gravity block 36 is installed in the middle of the upper part of the slide 35. The front and rear edges of the lower side of the slide 35 are connected to driving strips 37. The driving strips 37 are provided with teeth meshing with the gear 30. A limit structure is provided on the horizontal plate 33. The limiting structure is arranged at the limiting blocks 38 near the two ends in the guide groove 34, and a through hole 39 is provided in the middle of the limiting block 38. The left and right sides of the slide seat 35 are connected to the positions in the guide groove 34 with the second fixing rods 40. The left and right end groove walls of the guide groove 34 are movably penetrated by the second T-shaped rods 42, and the second T-shaped rods 42 are sleeved with a fourth spring 43. The two ends of the fourth spring 43 are respectively connected to one end of the second T-shaped rod 42 and the cross plate 33. A pushing block 41 is installed on the end of the second T-shaped rod 42 inserted into the guide groove 34. When the hull tilts, under the action of the gravity of the gravity block 36, the slide seat 35 is driven to move on the cross plate 33 toward the side of the tilted hull, and the driving bar 37 and the gear are used to move the slide seat 35 to the side of the tilted hull. The wheel 30 drives the switching seat 28 and the second protective plate 29 to rotate as a whole, so that the concave arc surface on the second protective plate 29 switches to the opposite direction of the hull tilt, to block the oil sliding in the transformer tank 1, thereby reducing the oil shaking and impacting the side of the transformer tank 1, which causes the deformation problem, and when the slide 35 moves, the limiting block 38 limits the slide 35, so that the second protective plate 29 remains in position after switching, thereby ensuring the protection quality of the second protective plate 29, and the movement of the slide 35 drives the second fixed rod 40 to move to the pushing block 41, pushing the second T-shaped rod 42 to move and lengthen the fourth spring 43, to reduce the noise generated when the slide 35 hits the limiting block 38.

[0019] The implementation principle of a marine transformer with a protective mechanism in an embodiment of the present invention is as follows: first, the transformer oil tank 1 is fixedly mounted on the hull through the mounting seat 2. When the hull shakes up and down during driving, the oil in the transformer oil tank 1 shakes up and down. The multiple first protective plates 10 on the upper and lower inner walls of the transformer oil tank 1 are used to block the flow, and the first protective plate 10 drives the first moving block 5 at one end of the first curved plate 6 to move in the first groove 4, driving the deformation of the first spring 9 to buffer and protect the oil, thereby reducing the impact of the oil on the upper and lower inner walls of the transformer oil tank 1, and further The second spring 12 is deformed to perform buffer protection on the outside of the transformer tank 1. At the same time, the movement of the sleeve 11 on the vertical rod drives the second moving block 17 and the first T-shaped rod 18 to move on the fixed block 14 as a whole through the second curved plate 15, driving the third spring 19 to deform, thereby converting part of the vertical impact force into lateral buffer protection, with higher protection quality. When the hull tilts left and right, under the action of the gravity of the gravity block 36, the slide seat 35 is driven to move upward and downward on the vertical rod to drive the second spring 12 to deform, thereby performing buffer protection on the outside of the transformer tank 1. The transverse plate 33 moves toward the side of the hull tilt, and drives the switching seat 28 and the second protective plate 29 to rotate as a whole through the driving bar 37 and the gear 30, so that the concave arc surface on the second protective plate 29 is switched to the opposite direction of the hull tilt, to block the oil sliding in the transformer tank 1, thereby reducing the problem of oil shaking impacting the side of the transformer tank 1 and causing deformation, and the protection is more comprehensive. When the slide seat 35 moves, the limiting block 38 limits the slide seat 35, so that the second protective plate 29 remains in place after switching, thereby ensuring the second protective plate 2 9 has a protective quality, and the movement of the slide 35 drives the second fixed rod 40 to move onto the pushing block 41, pushing the second T-shaped rod 42 to move and lengthen the fourth spring 43, so as to reduce the noise generated when the slide 35 hits the limit block 38. At the same time, the movement of the moving seat 26 on the fixed frame 20 drives the support plate 27 to move to the corresponding position under the transformer oil tank 1 to perform auxiliary support work, thereby reducing the problem of the vertical rod being broken due to excessive shaking force, and improving the installation firmness of the transformer oil tank 1 on the mounting seat 2. The structure is simple and the function is practical.

[0020] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A marine transformer with a protective mechanism, comprising a transformer oil tank (1) and a mounting seat (2), characterized in that: The transformer oil tank (1) is arranged above the mounting seat (2), a movable support structure is arranged in the middle of the upper side of the mounting seat (2), the transformer oil tank (1) is arranged on the mounting seat (2) via an external protective structure, a mounting frame (31) is fastened in the middle of the lower inner wall of the transformer oil tank (1), a winding (32) is mounted on the mounting frame (31), an internal protective structure is arranged at the upper and lower inner walls of the transformer oil tank (1), and side protective structures are arranged at the left and right sides of the lower inner wall of the transformer oil tank (1); The internal protection structure comprises a fixing bar (3) fixedly mounted in the middle of the inner walls of the upper and lower sides of the transformer oil tank (1); a first groove (4) is provided at a position close to both ends of the fixing bar (3); a first fixing rod (8) is connected between the groove walls at both ends of each first groove (4); a first moving block (5) is movably sleeved at one end of the first fixing rod (8); the first moving block (5) is slidably arranged in the first groove (4); a first spring (9) is sleeved on the first fixing rod (8); the two ends of the first spring (9) are respectively connected to the first moving block (5) and the groove wall at one end of the first groove (4); a top end of the first moving block (5) is rotatably connected to a first curved plate (6); one end of the first curved plate (6) is rotatably connected to a mounting plate (7); a plurality of first protection plates (10) are equidistantly mounted on a side surface of the mounting plate (7) away from the fixing bar (3); a side surface of the first protection plate (10) close to the winding (32) is a concave arc surface.

2. A marine transformer with a protective mechanism according to claim 1, characterized in that: The external protective structure comprises a fixing block (14) fixedly arranged at four corner positions on the mounting seat (2), the fixing block (14) being in the shape of a cross, a vertical rod being connected to the middle of the upper part of the fixing block (14), a sleeve (11) being movably sleeved on the vertical rod, a welding plate (13) being fastened on the top of the sleeve (11) by bolts, the welding plate (13) being welded to the transformer oil tank (1), a second spring (12) being sleeved on the vertical rod, two ends of the second spring (12) being respectively connected to the fixing block (14) and the bottom end of the sleeve (11), and an auxiliary protective structure being arranged on the fixing block (14).

3. A marine transformer with a protective mechanism according to claim 2, characterized in that: The auxiliary protection structure comprises four second grooves (16) formed on the fixed block (14); a second movable block (17) is slidably arranged at a groove wall of one end of the second groove (16) close to the sleeve (11); a first T-shaped rod (18) movably passing through the fixed block (14) is connected to one side surface of the second movable block (17); a third spring (19) is sleeved on the first T-shaped rod (18); two ends of the third spring (19) are respectively connected to one end of the first T-shaped rod (18) and the outer side surface of the fixed block (14); a top end of the second movable block (17) is rotatably connected to a second curved plate (15); and a top end of the second curved plate (15) is rotatably connected to the welding plate (13).

4. A marine transformer with a protective mechanism according to claim 1, characterized in that: The movable support structure comprises a fixed frame (20) fixedly mounted in the middle of the upper part of the mounting seat (2); third grooves (21) are respectively provided at the lower part of the inner walls on both the front and rear sides of the fixed frame (20); a third movable block (22) is slidably arranged in the third groove (21); fourth grooves (23) are respectively provided at the upper part of the inner walls on both the left and right sides of the fixed frame (20); a fourth movable block (24) is slidably arranged in the fourth groove (23); sliding rods (25) are respectively connected between the two fourth movable blocks (24) and between the two third movable blocks (22); a movable seat (26) is movably sleeved on the two sliding rods (25); and a support plate (27) is installed in the middle part of the upper part of the movable seat (26).

5. A marine transformer with a protective mechanism according to claim 1, characterized in that: The side protection structure comprises a switching seat (28) rotatably mounted on the lower inner wall of the transformer oil tank (1) near four corners, a gear (30) being fixedly sleeved on the bottom end of the switching seat (28), a second protection plate (29) being mounted on the top end of the switching seat (28), a side surface of the second protection plate (29) being a concave arc surface, and a switching structure being arranged on both left and right sides of the lower inner wall of the transformer oil tank (1).

6. A marine transformer with a protection mechanism according to claim 5, characterized in that: The switching structure comprises two horizontal plates (33) mounted on the left and right sides of the lower inner wall of the transformer oil tank (1); guide grooves (34) are provided in the middle of the front and rear sides of the horizontal plates (33); a slide seat (35) is sleeved on the guide groove (34); a gravity block (36) is mounted in the middle of the upper side of the slide seat (35); driving strips (37) are connected to the front and rear edges of the lower side of the slide seat (35); teeth are provided on the driving strip (37) and mesh with the gear (30); and a limit structure is provided on the horizontal plate (33).

7. A marine transformer with a protection mechanism according to claim 6, characterized in that: The limiting structure is provided with a limiting block (38) at positions near both ends in the guide groove (34); a through hole (39) is provided in the middle of the limiting block (38); second fixing rods (40) are connected to the left and right side surfaces of the slide seat (35) at positions in the guide groove (34); second T-shaped rods (42) are movably passed through the groove walls at both ends of the guide groove (34); a fourth spring (43) is sleeved on the second T-shaped rod (42); two ends of the fourth spring (43) are respectively connected to one end of the second T-shaped rod (42) and the cross plate (33); and a pushing block (41) is installed on one end of the second T-shaped rod (42) inserted into the guide groove (34).

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