New energy forklift battery capable of preventing local high temperature

Abstract

The invention provides a new energy forklift battery capable of preventing local high temperature, and relates to the technical field of forklift batteries, the new energy forklift battery comprises an upper base and a lower base, a battery cell is arranged between the upper base and the lower base, and the upper end of the upper base is provided with a refrigeration wafer and an alloy cooling fin; a heat conduction piece is arranged between every two adjacent columns of battery cells; the heat conduction part comprises alloy heat dissipation boxes and superconducting refrigeration plates, each alloy heat dissipation box is located between the two columns of battery cells, the upper end of each alloy heat dissipation box is connected with an alloy heat dissipation sheet, and at least six superconducting refrigeration plates are elastically and movably arranged on the two sides of each alloy heat dissipation sheet respectively; and the outer side of the superconductive refrigeration plate is propped against the outer surface of the battery cell. The superconducting refrigeration plate is in close contact with the battery cells, heat generated by the battery cells can be directly transmitted out in a heat conduction mode, heat generated by each battery cell can be effectively and evenly diffused, and therefore the service life of the battery cells is prolonged, and the safety of the battery cells is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of forklift batteries, and in particular to a new energy forklift battery capable of preventing local high temperature. Background Art

[0002] Electricity is used as energy, and its cost is lower than that of traditional fuels such as diesel and gasoline. In the long-term use process, the electricity cost of new energy forklifts is only a small part of the fuel cost of fuel forklifts, which can save a lot of operating costs for enterprises, especially for frequently used forklifts, the cost advantage is more obvious; its electricity mainly comes from battery packs; battery packs combine multiple cells in series and parallel to achieve specific voltage and capacity output. For example, connecting multiple 3.7V lithium-ion cells in series can get a higher voltage, such as 7.4V, 11.1V, etc.; connecting multiple cells in parallel can increase the capacity of the battery pack12. Battery packs are usually equipped with battery management systems (BMS) to monitor and manage the status of each cell, such as voltage, current, temperature, etc., to ensure the safe operation and service life of the battery pack;

[0003] For example, the prior art application number CN202111661960.9 discloses a portable new energy forklift battery module, which relates to the technical field of battery modules; it includes an upper support seat, a lower support seat, a plurality of battery cells located between the upper support seat and the lower support seat, and a spoiler device for promoting air flow between the battery cells; one end of the battery cell is inserted into the upper support seat, and the other end is inserted into the lower support seat; the upper support seat is provided with a plurality of limit grooves for limiting the aluminum row;

[0004] The above-mentioned prior art is known through actual use, and it mainly uses a blower to blow air directly into the gaps between battery cells to dissipate heat from the battery cells. However, if the battery cells are far away from the air outlet, especially the battery cells deep inside the battery pack, they cannot get enough air flow, resulting in insufficient heat dissipation and causing local high temperature of the battery; at the same time, when the blower is working, it will suck in the humid and dusty air in the surrounding environment and blow it to the gaps between the battery cells. Long-term accumulation may cause wear and scratches on the surface of the battery cells, affecting the insulation performance and service life of the battery cells, and may even cause safety problems such as internal short circuits in the battery. For this reason, we have improved the above-mentioned prior art based on actual usage. Summary of the invention

[0005] In view of the above problems, the present invention aims to provide a new energy forklift battery that can prevent local high temperature.

[0006] To achieve the technical purpose, the solution of the present invention is: a new energy forklift battery that prevents local high temperature, comprising an upper base and a lower base, a battery cell is arranged between the lower base and the upper base, and a refrigeration chip and an alloy heat sink are arranged at the upper end of the upper base; a heat conductive part is arranged between two adjacent rows of battery cells; the heat conductive part comprises an alloy heat sink and a superconducting refrigeration plate, each of the alloy heat sinks is located between two rows of battery cells and the upper end of each alloy heat sink is connected to the alloy heat sink, at least six superconducting refrigeration plates are elastically and movably arranged on both sides of each alloy heat sink, and the outer side of the superconducting refrigeration plate is pressed against the outer surface of the battery cell.

[0007] Preferably, a cooling chip is fixed to the upper surface of the upper base by bolts, an axial fan is also fixed to the upper end of the cooling chip, an alloy heat sink is welded to the front side of the cooling chip, and one end of each alloy heat sink is respectively welded to the upper surface of the alloy heat sink box.

[0008] Preferably, a support seat is welded to the upper surface of the lower base and a recess is provided on the inner side of the support seat, the inner wall of the recess is tightly pressed against the rear end of the alloy heat sink for supporting and installing the alloy heat sink, and the front end of the alloy heat sink is fixed to the upper surface of the lower base by bolts.

[0009] Preferably, the superconducting refrigeration plate is provided with heat dissipation holes, a surface of the superconducting refrigeration plate opposite to the outer surface of the battery core is arranged in an arc surface, and a driving mechanism is arranged in the alloy heat dissipation box for driving the superconducting refrigeration plate to move horizontally.

[0010] Preferably, through grooves are provided on both sides of the alloy heat dissipation box, and sliding rods pass through the two through grooves, and the outer ends of the sliding rods are integrally arranged with the superconducting refrigeration plate.

[0011] Preferably, a pressure block is integrally provided at the inner end of the slide rod, a circular ring is sleeved on the outer periphery of the slide rod, a No. 1 spring is welded between the circular ring and the pressure block, and the outer side of the circular ring is pressed against the inner wall of the alloy heat sink.

[0012] Preferably, a magnetic block is provided on the outer sleeve of the sliding rod, and the inner side of the magnetic block is adsorbed on the outer wall of the alloy heat dissipation box.

[0013] Preferably, the driving mechanism includes a round rod, a protrusion and a moving block; a rotating rod is rotatably provided at the front end of the alloy heat dissipation box, one end of the rotating rod extends to the alloy heat dissipation box and is fixed to the front side of the round rod for driving the round rod to rotate, and a protrusion is integrally provided on the outer surface of the round rod; the moving block is elastically and movably arranged in the alloy heat dissipation box and the moving block is located below the protrusion, an arc block is integrally provided on the upper surface of the moving block, the outer surface of the arc block is pressed against the protrusion, and slopes are provided on both sides of the moving block, and the slopes are pressed against the pressure block for driving the pressure block to move.

[0014] Preferably, a horizontal plate is integrally provided on the upper surface of the movable block, a vertical pole is fixed to the inner wall of the alloy heat dissipation box, a No. 2 spring is sleeved on the outer periphery of the vertical pole, the lower end of the vertical pole passes through the horizontal plate, and the No. 2 spring is welded between the upper surface of the horizontal plate and the top cap of the vertical pole.

[0015] Preferably, the front end of the alloy heat sink is provided with an anti-skid groove, the front end internal thread of the rotating rod is provided with a locking bolt, and one end of the locking bolt is tightly pressed against the anti-skid groove;

[0016] 1. In the present invention, after the superconducting refrigeration plate is in direct contact with the battery core, the heat of the battery core can be transferred to the alloy heat sink through the alloy slide bar, and the heat on the alloy heat sink will be transferred to the alloy heat sink, and then the alloy heat sink disperses the heat, and then after the axial flow fan is started, the air flow rate around the refrigeration chip is accelerated, so that the refrigeration chip generates low temperature, and the low temperature is transferred to the battery core. Since the superconducting refrigeration plate is in close contact with the battery core, the heat generated by the battery core can be directly transferred out by heat conduction, and the heat generated by each battery core can be effectively and evenly diffused, which can avoid the local uneven heat dissipation, local high temperature and short circuit caused by factors such as the distance from the air outlet, the size of the gap, and the airflow containing moisture and dust, as in the case of a blower, thereby increasing the life and safety of the battery core;

[0017] 2. By pulling the magnetic block in the heat-conducting part to separate from the outer surface of the alloy heat sink, the slide bar can be pulled to slide in the through groove to drive the superconducting cooling plate to move flexibly, thereby changing the distance between two adjacent superconducting cooling plates, and being able to adapt to the cells at different distances, thus improving adaptability;

[0018] 3. Then the rotatable rotating rod drives the round rod to rotate and drives the protrusion to rotate. When the protrusion rotates and contacts the arc block of the moving block, it will push the moving block to move downward as a whole. After the moving block moves downward, its slope will contact the pressure block and gradually apply an outward thrust, so that the pressure block pushes the sliding rod to move each superconducting cooling plate and press against the outer surface of each battery cell. The positions of the two rows of superconducting cooling plates will change flexibly with the rotation of the rotating rod, which can cope with gaps of different widths between battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a front view schematic diagram of the present invention;

[0021] Figure 3 It is a schematic diagram of the heat conducting member of the present invention;

[0022] Figure 4 For the present invention Figure 1 The enlarged schematic diagram at a in the middle;

[0023] Figure 5 It is a schematic diagram of the superconducting refrigeration plate in the heat conducting member of the present invention being unfolded outward;

[0024] Figure 6 It is a schematic diagram of the inward contraction of the superconducting refrigeration plate in the heat conducting member of the present invention;

[0025] Figure 7 For the present invention Figure 5 The enlarged schematic diagram at b in the middle;

[0026] Figure 8 It is a schematic diagram of the movable block, the round rod and the protruding block of the present invention;

[0027] Fig. 9 It is another perspective schematic diagram of the present invention;

[0028] Fig.10 It is an enlarged schematic diagram of point a of the present invention.

[0029] Among them, 1. upper base; 2. lower base; 3. battery core; 4. cooling chip; 5. alloy heat sink; 6. thermal conductive part; 61. alloy heat sink; 62. driving mechanism; 63. superconducting cooling plate; 64. heat dissipation hole; 65. through groove; 66. anti-skid groove; 67. sliding rod; 68. spring No. 1; 69. pressure block; 610. horizontal plate; 611. circular ring; 612. magnetic block; 7. supporting seat; 8. notch; 9. axial flow fan; 10. locking bolt; 621. rotating rod; 622. round rod; 623. moving block; 624. protrusion; 625. arc block; 626. slope; 627. vertical pole; 628. spring No. 2. DETAILED DESCRIPTION

[0030] The invention of this application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In order to clearly and completely describe the technical solution, the following embodiments are selected for illustration; based on the contents recorded in this application, other embodiments obtained without creative work are all within the scope of protection of the present invention.

[0031] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "top / bottom" and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of clearly describing the present embodiment, rather than indicating or implying that the device or element referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] like Figures 1 to 10As shown, an embodiment of the present invention provides a new energy forklift battery that prevents local high temperature, including an upper base 1 and a lower base 2, a battery cell 3 is arranged between the lower base 2 and the upper base 1, and a mixed refrigeration chip 4 and an alloy heat sink 5 made of aluminum and copper are arranged on the upper end of the upper base 1; a heat conductor 6 is arranged between two adjacent columns of battery cells 3; the heat conductor 6 includes an alloy heat sink 61 made of metal aluminum and iron and a superconducting refrigeration plate 63 made of alloy, each alloy heat sink 61 is located between the two columns of battery cells 3 and the upper end of each alloy heat sink 61 is connected to the alloy heat sink 5, at least six superconducting refrigeration plates 63 are elastically and movably arranged on both sides of each alloy heat sink 5, and the outer side of the superconducting refrigeration plate 63 is pressed against the outer surface of the battery cell 3.

[0033] The materials of the cooling chip 4 and the superconducting cooling plate 63 can be: bismuth telluride-based alloy, lead telluride-based alloy.

[0034] Bismuth telluride-based alloy, performance characteristics: Bismuth telluride is a classic thermoelectric material, and its base alloy has a high thermoelectric figure of merit, which can achieve a good cooling effect. Its advantages are fast cooling speed, can reach a certain temperature difference in a short time, and a wide operating temperature range, which is suitable for cooling needs in various environments. Advantages of cooperation: The axial flow fan 9 can enhance air flow and accelerate heat dissipation. When combined with the bismuth telluride-based alloy cooling chip 4, it can take away the heat absorbed by the cooling end of the chip in time, improve the cooling efficiency, and make the cooling effect more significant, so that a lower temperature can be obtained.

[0035] Performance characteristics of lead telluride-based alloys: Lead telluride-based alloys have good thermoelectric properties in the medium and high temperature range, and their thermal conductivity is relatively low, which is conducive to maintaining a large temperature gradient, thereby achieving efficient refrigeration. At higher temperatures, the stability of its refrigeration performance is better, and it can continuously and stably produce a refrigeration effect. Advantages of cooperation: When the axial fan 9 is combined with the lead telluride-based alloy refrigeration chip 4, in a medium and high temperature environment, the fan can effectively reduce the hot end temperature of the chip, ensuring that a large temperature difference is maintained at both ends of the chip, thereby giving full play to the refrigeration advantages of the lead telluride-based alloy in this temperature range and achieving a better low-temperature generation effect.

[0036] refer to Figure 1 The upper surface of the upper base 1 is fixed with a cooling chip 4 by bolts. 2-4 axial flow fans 9 are also fixed to the upper end of the cooling chip 4. An alloy heat sink 5 is welded to the front side of the cooling chip 4. One end of each alloy heat sink 5 is welded to the upper surface of the alloy heat sink box 61 for dispersing heat.

[0037] refer to Fig. 9A support seat 7 is welded on the upper surface of the lower base 2 and a recess 8 is provided on the inner side of the support seat 7. The inner wall of the recess 8 is tightly pressed against the rear end of the alloy heat sink 61 for supporting and installing the alloy heat sink 61. The front end of the alloy heat sink 61 is fixed to the upper surface of the lower base 2 by bolts.

[0038] refer to Figure 7 , a heat dissipation hole 64 is arranged in the superconducting refrigeration plate 63, and the side of the superconducting refrigeration plate 63 opposite to the outer surface of the battery core 3 is arranged in an arc surface, and a driving mechanism 62 is arranged in the alloy heat dissipation box 61 for driving the superconducting refrigeration plate 63 to move horizontally. Through grooves 65 are arranged on both sides of the alloy heat dissipation box 61, and a slide bar 67 passes through the two through grooves 65, and the outer end of the slide bar 67 is integrally arranged with the superconducting refrigeration plate 63. A pressure block 69 is integrally arranged at the inner end of the slide bar 67, and a circular ring 611 is sleeved on the outer periphery of the slide bar 67. A No. 1 spring 68 is welded between the circular ring 611 and the pressure block 69 to return the superconducting refrigeration plate 63 to its original position. The outward movement of the slide bar 67 will compress the No. 1 spring 68 to generate a rebound force. When the slide bar 67 moves inward, the No. 1 spring 68 generates a rebound force to accelerate the return of the superconducting refrigeration plate 63, and the outer side of the circular ring 611 is tightly pressed against the inner wall of the alloy heat dissipation box 61.

[0039] refer to Figure 7 A magnetic block 612 is provided on the outer sleeve of the slide bar 67 . There is a small amount of metallic iron in the alloy on both sides of the alloy heat sink 61 . The inner side of the magnetic block 612 can be adsorbed on the outer wall of the alloy heat sink 61 .

[0040] refer to Figure 7 The driving mechanism 62 includes a round rod 622, a protrusion 624 and a moving block 623; a rotating rod 621 is rotatably provided at the front end of the alloy heat dissipation box 61, one end of the rotating rod 621 is extended to the alloy heat dissipation box 61 and is fixed to the front side of the round rod 622 for driving the round rod 622 to rotate, and a protrusion 624 is integrally provided on the outer surface of the round rod 622; the moving block 623 is elastically and movably arranged in the alloy heat dissipation box 61 and the moving block 623 is located below the protrusion 624, an arc block 625 is integrally provided on the upper surface of the moving block 623, the outer surface of the arc block 625 is tightly pressed against the protrusion 624, and slopes 626 are provided on both sides of the moving block 623, and the slopes 626 are tightly pressed against the pressure block 69 for driving the pressure block 69 to move.

[0041] refer to Figure 7, the upper surface of the moving block 623 is integrally provided with a horizontal plate 610, the inner wall of the alloy heat sink 61 is fixed with a vertical rod 627, the outer periphery of the vertical rod 627 is sleeved with a second spring 628, the lower end of the vertical rod 627 passes through the horizontal plate 610, and the second spring 628 is welded between the upper surface of the horizontal plate 610 and the top cap of the vertical rod 627. The downward movement of the moving block 623 will drive the horizontal plate 610 to move downward, pulling the second spring 628 to stretch and generate rebound force. When the lower end of the protrusion 624 is not rotated and pushed tightly with the arc block 625 when the rotating rod 621 is reversed, the moving block 623 will reset under the rebound force of the second spring 628.

[0042] The front end of the alloy heat sink 61 is provided with an anti-skid groove 66 , and the front end of the rotating rod 621 is internally threaded with a locking bolt 10 , and one end of the locking bolt 10 is pressed against the anti-skid groove 66 to prevent the rotating rod 621 from rotating.

[0043] Working principle: When using and installing, determine the distance between two adjacent battery cells 3 in each column of the battery pack, then pull the magnetic block 612 in the heat conductive part 6 to separate from the outer surface of the alloy heat dissipation box 61, and then pull the slide bar 67 to slide in the through groove 65 to drive the superconducting refrigeration plate 63 to move flexibly, thereby changing the distance between two adjacent superconducting refrigeration plates 63. When it is adjusted to the same distance as the distance between two adjacent battery cells 3 in each column of the battery pack, the position of the superconducting refrigeration plate 63 can be adjusted and locked by pushing the magnetic block 612 to adsorb to the outer surface of the alloy heat dissipation box 61 again, so as to adapt to battery cells 3 at different distances and improve adaptability. Then place the alloy heat dissipation box 61 in the gap between each column of battery cells 3, so that each superconducting refrigeration plate 63 is opposite to the outer surface of each battery cell 3, and the installation of the heat conductive part 6 is completed;

[0044] Then, the rotating rod 621 can be rotated to drive the round rod 622 to rotate and drive the protrusion 624 to rotate. When the protrusion 624 rotates and contacts the arc block 625 of the moving block 623, it will push the moving block 623 to move downward as a whole. After the moving block 623 moves downward, its slope 626 will contact the pressure block 69 and gradually apply an outward thrust, so that the pressure block 69 pushes the slide bar 67 to move each superconducting refrigeration plate 63 on both sides of the alloy heat dissipation box 61 and press against the outer surface of each battery cell 3. Then, the locking bolt 10 is tightened against the anti-slip groove 66 to prevent the rotating rod 621 from rotating, so as to lock the position of the superconducting refrigeration plate 63, so that the superconducting refrigeration plate 63 and each battery cell 3 are always pressed against each other. The positions of the two rows of superconducting refrigeration plates 63 will change flexibly with the rotation of the rotating rod 621, so as to cope with gaps of different widths between the battery cells 3.

[0045] After the superconducting refrigeration plate 63 is in direct contact with the battery cell 3, the heat of the battery cell 3 can be transferred to the alloy heat sink 61 through the alloy slide bar 67. The heat on the alloy heat sink 61 will be transferred to the alloy heat sink 5, and then the alloy heat sink 5 will disperse the heat. After that, after the axial flow fan 9 is started, the air flow rate around the refrigeration chip 4 is accelerated, so that the refrigeration chip 4 generates a low temperature, and the low temperature is transferred to the battery cell 3, so as to achieve the effect of quickly dissipating the heat of the battery cell 3; since the superconducting refrigeration plate 63 is in close contact with the battery cell 3, the heat generated by the battery cell 3 can be directly transferred out by heat conduction, and the heat generated by each battery cell 3 can be effectively and evenly diffused, which can avoid local uneven heat dissipation and short circuit damage to the battery cell 3 caused by factors such as the distance from the air outlet, the size of the gap, and the airflow containing moisture and dust like a blower, thereby increasing the life and safety of the battery cell 3.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any slight modification, equivalent substitution and improvement made to the above embodiment based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. A new energy forklift battery for preventing local high temperature, comprising an upper base (1) and a lower base (2), wherein a battery cell (3) is arranged between the lower base (2) and the upper base (1), and characterized in that: A cooling chip (4) and an alloy heat sink (5) are provided at the upper end of the upper base (1); A heat conducting member (6) is provided between two adjacent rows of battery cells (3); The heat conducting member (6) comprises an alloy heat dissipation box (61) and a superconducting refrigeration plate (63); each of the alloy heat dissipation boxes (61) is located between two rows of battery cells (3) and the upper end of each alloy heat dissipation box (61) is connected to an alloy heat sink (5); at least six superconducting refrigeration plates (63) are elastically and movably arranged on both sides of each alloy heat sink (5); and the outer side of the superconducting refrigeration plate (63) is tightly pressed against the outer surface of the battery cell (3).

2. The new energy forklift battery for preventing local high temperature according to claim 1, characterized in that: The upper surface of the upper base (1) is fixed with a cooling chip (4) by means of bolts, an axial flow fan (9) is also fixed to the upper end of the cooling chip (4), an alloy heat sink (5) is welded to the front side of the cooling chip (4), and one end of each of the alloy heat sinks (5) is respectively welded to the upper surface of the alloy heat sink box (61).

3. The new energy forklift battery for preventing local high temperature according to claim 2, characterized in that: A support seat (7) is welded to the upper surface of the lower base (2), and a notch (8) is provided on the inner side of the support seat (7); the inner wall of the notch (8) is tightly pressed against the rear end of the alloy heat dissipation box (61) for supporting and installing the alloy heat dissipation box (61); the front end of the alloy heat dissipation box (61) is fixed to the upper surface of the lower base (2) by bolts.

4. The new energy forklift battery for preventing local high temperature according to claim 1, characterized in that: The superconducting refrigeration plate (63) is provided with a heat dissipation hole (64), the side of the superconducting refrigeration plate (63) opposite to the outer surface of the battery core (3) is arranged in an arc surface, and the alloy heat dissipation box (61) is provided with a driving mechanism (62) for driving the superconducting refrigeration plate (63) to move horizontally.

5. The new energy forklift battery for preventing local high temperature according to claim 4, characterized in that: Through slots (65) are provided on both sides of the alloy heat dissipation box (61), and sliding rods (67) pass through the two through slots (65). The outer ends of the sliding rods (67) are integrally arranged with the superconducting refrigeration plate (63).

6. The new energy forklift battery for preventing local high temperature according to claim 5, characterized in that: A pressure block (69) is integrally provided at the inner end of the slide rod (67), a circular ring (611) is sleeved on the outer periphery of the slide rod (67), a spring (68) is welded between the circular ring (611) and the pressure block (69), and the outer side of the circular ring (611) is tightly pressed against the inner wall of the alloy heat sink (61).

7. The new energy forklift battery for preventing local high temperature according to claim 6, characterized in that: The outer periphery of the sliding rod (67) is provided with a magnetic block (612), and the inner side of the magnetic block (612) is adsorbed onto the outer wall of the alloy heat dissipation box (61).

8. The new energy forklift battery for preventing local high temperature according to claim 5, characterized in that: The driving mechanism (62) comprises a round rod (622), a convex block (624) and a moving block (623); A rotating rod (621) is rotatably provided at the front end of the alloy heat dissipation box (61); one end of the rotating rod (621) extends to the alloy heat dissipation box (61) and is fixed to the front side of the round rod (622) for driving the round rod (622) to rotate; a convex block (624) is integrally provided on the outer surface of the round rod (622); The movable block (623) is elastically and movably arranged in the alloy heat dissipation box (61) and is located below the protrusion (624). An arc block (625) is integrally arranged on the upper surface of the movable block (623). The outer surface of the arc block (625) is pressed against the protrusion (624). Slopes (626) are arranged on both sides of the movable block (623). The slopes (626) are pressed against the pressure block (69) to drive the pressure block (69) to move.

9. The new energy forklift battery for preventing local high temperature according to claim 8, characterized in that: A transverse plate (610) is integrally provided on the upper surface of the moving block (623); a vertical rod (627) is fixed to the inner wall of the alloy heat dissipation box (61); a second spring (628) is sleeved on the outer periphery of the vertical rod (627); the lower end of the vertical rod (627) passes through the transverse plate (610); and the second spring (628) is welded between the upper surface of the transverse plate (610) and the top cap of the vertical rod (627).

10. The new energy forklift battery for preventing local high temperature according to claim 8, characterized in that: The front end of the alloy heat dissipation box (61) is provided with an anti-skid groove (66), and the front end of the rotating rod (621) is provided with a locking bolt (10) through an internal thread, and one end of the locking bolt (10) is tightly pressed against the anti-skid groove (66).

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