Water nozzle sealing device of domain control water cooling plate

Abstract

The invention discloses a domain control water cooling plate water nozzle sealing device, and relates to the technical field of water cooling plates, the domain control water cooling plate water nozzle sealing device comprises an integrally formed hoop and a sealing cap installed outside the hoop, the hoop comprises two half hoops capable of being bent oppositely, and the sealing cap is installed outside the two half hoops in a threaded mode. A sealing mechanism for sealing the water nozzle from the interior of the water nozzle is arranged in the sealing cap, the sealing mechanism comprises a spacer ring fixedly installed on the inner wall of the sealing cap, a support is fixedly installed in the spacer ring, and a circular sealing air bag is installed on one side of the support; a pull rod coaxial with the sealing air bag is connected into the sealing cap in a sliding mode. The sealing cap can be installed on the water nozzle to seal the water nozzle, the sealing mechanism is arranged in the sealing cap, the water nozzle can be plugged from the interior of the water nozzle through the plugging block and the sealing air bag, grinding fluid, steel needles and other foreign matter are prevented from entering a flow channel from the water nozzle, and the sealing effect of the sealing cap is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of water cooling plates, and in particular to a water nozzle sealing device for a domain controlled water cooling plate. Background Art

[0002] In the production process of domain control water-cooled plates, magnetic grinding is widely used as an effective surface finishing method in processes such as die-casting capes and CNC post-burr removal. During the magnetic grinding process, magnetic abrasives are arranged along a specific magnetic field direction to form an "abrasive brush", which grinds the workpiece surface by rotation and movement. Commonly used magnetic abrasives are made of steel needles with a diameter of 1.0 mm and a length of 15 mm. However, during the magnetic grinding process, the magnetic grinding fluid and the steel needle are likely to enter the flow channel of the water-cooled plate, affecting the heat dissipation effect.

[0003] At present, in order to prevent magnetic grinding fluid and steel needles from entering the flow channel of the water cooling plate, silicone plugs and other methods are usually used to seal the water nozzles. However, traditional sealing materials such as silicone plugs are not only prone to loosening during use, but also have a high probability of falling off, causing impurities such as grinding fluid or steel needles to enter the water cooling plate along the flow channel, reducing the cooling efficiency of the product. Under long-term use conditions, pollutants may corrode the product, further deteriorate the cooling effect, cause the temperature of the vehicle domain controller to rise, and even affect the service life of the server, increasing the risk of vehicle use. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a domain-controlled water-cooling plate faucet sealing device, which solves the technical problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a domain control water cooling plate faucet sealing device, comprising an integrally formed clamp and a sealing cap installed on the outside thereof, the clamp comprising two relatively bendable half clamps, the sealing cap being threadedly installed on the outside of the two half clamps, and a sealing mechanism for sealing the faucet from the inside thereof is provided inside the sealing cap;

[0006] The sealing mechanism includes a spacer ring fixedly mounted on the inner wall of the sealing cap, a support fixedly mounted inside the spacer ring, a circular sealing airbag mounted on one side of the support, a pull rod coaxially arranged with the sealing airbag being slidably connected inside the sealing cap, one end of the pull rod passes through the support and the sealing airbag in turn, and a blocking block is installed to prevent foreign objects such as grinding fluid or steel needles from entering the domain control water cooling plate from the water nozzle, and a limit piece for fixing the pull rod is arranged outside the sealing cap.

[0007] Furthermore, an adaptation groove is provided between the two half clamps, and a plurality of evenly distributed first springs are fixedly installed inside the adaptation groove, and a sub-buckle is provided at the bottom of one of the half clamps, and a female buckle matched with the sub-buckle is provided at the bottom of the other half clamp.

[0008] Furthermore, the limiting member includes a steering piece fixedly mounted on the end of the pull rod and an extension rod fixedly mounted on the bottom of the sealing cap, and one side of the extension rod is provided with a plurality of limiting grooves for the steering piece to be inserted.

[0009] Furthermore, both of the half clamps are provided with an anti-slip mechanism, and the anti-slip mechanism includes a support rod fixedly installed on the side of the half clamp, the inner bottom wall and the inner top wall of the support rod are fixedly connected with a second spring, the end of the second spring is fixedly connected with a clamping block with a triangular cross-section, the two clamping blocks are symmetrically arranged, and both sides of the sealing cap are slidably connected with a bending rod, and the top and bottom of the bending rod are provided with clamping grooves adapted to the clamping blocks.

[0010] Furthermore, a pointed head is provided at the end of the bending rod, the pointed head is provided between two clamping blocks, and the slope of the pointed head is set to 15°-35°.

[0011] Furthermore, the side surfaces of the two clamping blocks are extended to the outside of the support rod and are hinged with connecting rods, a connecting seat is installed between the two connecting rods, and the ends of the two connecting rods are rotatably installed on the connecting seat.

[0012] Furthermore, a transmission member is arranged between the pull rod and the anti-slip mechanism, and the transmission member includes a gear slidably mounted on the outside of the pull rod, and the gear is rotatably installed at a central position of the outer wall of the sealing cap. The outer wall of the sealing cap is also slidably installed with two racks meshing with the gears, and the two racks are respectively arranged on the upper and lower sides of the gear, and the two bending rods are respectively fixedly installed on the ends of the two racks.

[0013] Furthermore, a third spring is fixedly mounted on one end of the rack facing away from the bending rod, a fixing plate is fixedly mounted on the end of the third spring, and the fixing plate is fixedly mounted on the sealing cap.

[0014] Furthermore, a circular main air cavity and an annular auxiliary air cavity are arranged inside the sealed airbag, and at least five dividing strips connected to the outer wall of the main air cavity are arranged inside the auxiliary air cavity.

[0015] Furthermore, the blocking block is movably sleeved on the outside of the pull rod, and the outside of the pull rod is also fixedly sleeved with an abutment sheet that fits with one side of the blocking block, and the end of the pull rod is threadedly installed with an anti-drop cap that fits with the other side of the blocking block.

[0016] By means of the above technical solution, the present invention provides a domain-controlled water-cooling plate faucet sealing device, which has at least the following beneficial effects:

[0017] 1. The present invention can install the sealing cap on the faucet to seal it by arranging a clamp, and a sealing mechanism is arranged inside the sealing cap, which can seal the faucet from the inside of the faucet through a sealing block and a sealing airbag to prevent foreign objects such as grinding fluid and steel needles from entering the flow channel from the faucet, thereby optimizing the sealing effect of the sealing cap.

[0018] 2. The present invention provides an anti-slip mechanism, which can cooperate with the anti-slip mechanism to lock the clamp and the sealing cap during the process of the sealing mechanism blocking the water nozzle, preventing the sealing cap from loosening and falling off, improving the stability of the connection between the clamp and the sealing cap, and further optimizing the sealing effect of the equipment.

[0019] 3. The present invention provides a main air cavity, a secondary air cavity and a partition strip in the sealing air bag. The partition strip can not only cooperate with the main air cavity to provide support for the sealing air bag as a whole, but also divide the internal space of the secondary air cavity into multiple small chambers. When one of the small chambers is damaged, the other small chambers can still cooperate with the main air cavity to support the sealing air bag to seal the faucet, which can greatly reduce the possibility of contamination of the flow channel due to damage to the sealing air bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 One of the exploded views of the present invention;

[0022] Figure 2 It is a schematic diagram of the hoop structure of the present invention;

[0023] Figure 3 It is one of the overall structural schematic diagrams of the present invention;

[0024] Figure 4 This is the second schematic diagram of the overall structure of the present invention;

[0025] Figure 5 It is a schematic diagram of the sealing cap structure of the present invention;

[0026] Figure 6 It is a schematic diagram of the sealing mechanism structure of the present invention;

[0027] Figure 7 This is the second exploded view of the present invention;

[0028] Figure 8 for Figure 7 An enlarged view of point A is shown.

[0029] In the figure:

[0030] 1. Clamp; 101. Half clamp; 102. Adaptation groove; 103. Sub-buckle; 104. Female buckle;

[0031] 2. Sealing cap;

[0032] 3. The first spring;

[0033] 4. Sealing mechanism; 41. Spacer ring; 42. Support; 43. Sealing airbag; 431. Main air chamber; 432. Auxiliary air chamber; 433. Separator; 44. Pull rod; 45. Limiting member; 451. Steering plate; 452. Extension rod; 453. Limiting groove; 46. Transmission member; 461. Gear; 462. Rack; 463. Third spring; 464. Fixing plate; 47. Blocking block; 48. Abutting plate; 49. Anti-drop cap;

[0034] 5. Anti-slip mechanism; 51. Support rod; 52. Second spring; 53. Block; 54. Connecting rod; 55. Connecting seat; 56. Bending rod; 57. Slot; 58. Sharp head. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1

[0037] In order to solve the technical problem that the sealing structure of the traditional domain control water cooling plate nozzle is easy to loosen, and impurities such as grinding fluid or steel needles will enter the water cooling plate along the flow channel, reducing the cooling efficiency of the product, please refer to Figure 1-Figure 3The present invention provides a domain-controlled water-cooled plate faucet sealing device, which can install a sealing cap 2 on the faucet to seal it, thereby preventing foreign objects such as grinding fluid and steel needles from entering the flow channel from the faucet. The sealing device is provided with an integrally formed clamp 1 and a sealing cap 2 installed on the outside thereof, the clamp 1 includes two relatively bendable half clamps 101, an adaption groove 102 is provided between the two half clamps 101, the adaption groove 102 can provide bending space for the two half clamps 101, and it is convenient to unfold the two half clamps 101 and wrap them around the outside of the faucet, and a plurality of evenly distributed first springs 3 are fixedly installed inside the adaption groove 102, and the two half clamps 101 can be tightly clamped on the faucet by the elastic force of the first springs 3, and a sub-buckle 103 is provided at the bottom of one of the half clamps 101, and a female buckle 104 matched with the sub-buckle 103 is provided at the bottom of the other half clamp 101, after the half clamps 101 are installed, the sub-buckle 103 can be clamped in the female buckle 104, so as to achieve preliminary fixation of the two half clamps 101, and combine to form the clamp 1, Figure 1 A sealing gasket is also provided between the clamp 1 and the sealing cap 2, and the sealing gasket is fixedly installed on the inner wall of the sealing cap 2. Then the sealing cap 2 can be threadedly installed on the clamp 1. At this time, the sealing cap 2 and the sealing gasket can block the water nozzle to achieve sealing of the water nozzle.

[0038] Embodiment 2

[0039] The sealing effect of sealing the faucet only with a sealing gasket is limited, especially the thread between the sealing cap 2 and the clamp 1 may be loose, which may easily lead to a gap between the faucet and the sealing gasket. The grinding fluid may still enter the faucet, causing the flow channel to be contaminated. In order to further optimize the sealing effect of the equipment on the faucet, please refer to Figure 4-Figure 7A sealing mechanism 4 is provided inside the sealing cap 2 for sealing it from the inside of the water nozzle, so that even if the sealing cap 2 and the clamp 1 are loose, the sealing mechanism 4 can block the liquid source from the inside of the water nozzle, wherein a spacer ring 41 is fixedly installed on the inner wall of the sealing cap 2, a support 42 is fixedly installed inside the spacer ring 41, and a ring-shaped sealing airbag 43 is installed on one side of the support 42. A pull rod 44 coaxially arranged with the sealing airbag 43 is slidably connected inside the sealing cap 2, one end of the pull rod 44 passes through the support 42 and the sealing airbag 43 in turn, and a blocking block 47 is installed to prevent foreign matter such as grinding liquid or steel needles from entering the domain control water cooling plate from the water nozzle, and the blocking block 47 is conically arranged, and its diameter is from the diameter close to the sealing airbag 43. The sealing airbag 43 is a small part of the faucet, and the ...

[0040] After pulling the pull rod 44 to drive the sealing block 47 and the sealing air bag 43 to seal the faucet, the pull rod 44 needs to be fixed. Therefore, a limiting member 45 for fixing the pull rod 44 is provided on the outside of the sealing cap 2. The limiting member 45 includes a steering plate 451 fixedly installed at the end of the pull rod 44 and an extension rod 452 fixedly installed at the bottom of the sealing cap 2. One side of the extension rod 452 is provided with a plurality of limiting grooves 453 for the steering plate 451 to be inserted. Pull the pull rod 44 to a certain position, and then rotate the steering plate 451 so that the steering plate 451 is inserted into the limiting groove 453. The limiting groove 453 can limit the steering plate 451 in the front and rear directions to prevent the pull rod 44 from sliding, thereby ensuring that the sealing air bag 43 can be in close contact with the inner wall of the faucet to prevent the faucet from being contaminated.

[0041] Embodiment 3

[0042] In order to enhance the stability between the sealing cap 2 and the clamp 1 and further ensure the sealing effect of the equipment on the water nozzle, an anti-slip mechanism 5 is provided on the two half clamps 101, and the anti-slip mechanism 5 is configured as a support rod 51 fixedly installed on the side of the half clamp 101, and the inner bottom wall and the inner top wall of the support rod 51 are fixedly connected with a second spring 52, and the end of the second spring 52 is fixedly connected with a block 53 with a triangular cross-section, and the two blocks 53 are symmetrically arranged. Bending rods 56 are slidably connected on both sides of the sealing cap 2, and the top and bottom of the bending rod 56 are provided with a clamping groove 57 adapted to the block 53. After the bending rod 56 slides into the support rod 51, the block 53 can be engaged in the clamping groove 57 by the elastic force of the second spring 52, so as to realize the connection between the support rod 51 and the bending rod 56, thereby realizing the secondary connection between the clamp 1 and the sealing cap 2, and preventing the sealing cap 2 from falling off the clamp 1 when the thread is loose.

[0043] When the bending rod 56 slides into the support rod 51, the two blocks 53 need to be squeezed apart. Therefore, a pointed head 58 is provided at the end of the bending rod 56. The pointed head 58 is provided between the two blocks 53, and the slope of the pointed head 58 is set to 15°-35°. The pointed head 58 can squeeze the two blocks 53 apart when sliding toward the block 53. At this time, the second spring 52 is deformed until the pointed head 58 moves to the block 53 corresponding to the slot 57. The block 53 can enter the slot 57 through the elastic force of the second spring 52, thereby locking the bending rod 56.

[0044] After the sealing cap 2 is installed, it is necessary to first rotate the steering plate 451 to fix the steering plate 451, and then slide the bending rod 56 to fix the bending rod 56. The two operation steps are relatively troublesome. In order to solve this technical problem, the above two operation steps can be simplified into one operation step. A transmission member 46 is provided between the pull rod 44 and the anti-slip mechanism 5. The transmission member 46 includes a gear 461 slidably sleeved on the outside of the pull rod 44. The gear 461 is rotatably installed in the center position of the outer wall of the sealing cap 2. The outer wall of the sealing cap 2 is also slidably installed with two racks meshing with the gear 461. 462, two racks 462 are respectively arranged on the upper and lower sides of the gear 461, and two bending rods 56 are respectively fixedly installed on the ends of the two racks 462. When the steering plate 451 is rotated, the pull rod 44 and the gear 461 on the pull rod 44 can be driven to rotate. The rotation of the gear 461 can drive the rack 462 to slide, and the rack 462 pushes the bending rod 56 to slide, so that the steering plate 451 is rotated and fixed, and at the same time, the bending rod 56 is sent into the support rod 51 to lock the bending rod 56, which ensures the sealing effect of the water nozzle on the one hand, and ensures the stability of the connection between the clamp 1 and the sealing cap 2 on the other hand.

[0045] In order to facilitate unlocking the pull rod 44, that is, to facilitate disassembly and maintenance of the sealing cap 2, a third spring 463 is fixedly installed on the end of the rack 462 facing away from the bending rod 56, and a fixing plate 464 is fixedly installed on the end of the third spring 463. The fixing plate 464 is fixedly installed on the sealing cap 2. When the rack 462 slides and drives the bending rod 56 to be locked, the third spring 463 is in a deformed state. When the locking state of the bending rod 56 is released, the bending rod 56 and the rack 462 can be reset by the elastic force of the third spring 463, and at the same time drive the gear 461 to reverse, so that the steering plate 451 is moved out of the extension rod 452. There is no need to manually slide the rack 462, thus saving operating steps in the disassembly process.

[0046] Reference Figure 8 As shown, the sides of the two clamping blocks 53 extend to the outside of the support rod 51 and are hinged with a connecting rod 54. A connecting seat 55 is installed between the two connecting rods 54, and the ends of the two connecting rods 54 are rotatably installed on the connecting seat 55. Pressing the connecting seat 55 can drive the two connecting rods 54 to rotate. The rotation of the connecting rod 54 can push the two clamping blocks 53 open, prompting the bending rod 56 to reset. Therefore, when removing the sealing cap 2, it is only necessary to press the two connecting seats 55.

[0047] Embodiment 4

[0048] Since the sealing airbag 43 plays a major sealing role in the sealing cap 2, if the sealing airbag 43 is damaged and leaks, the sealing airbag 43 will not be able to fit tightly against the faucet and the blocking block 47, affecting the sealing effect of the equipment. In order to solve this technical problem, a circular main air cavity 431 and an annular auxiliary air cavity 432 are provided inside the sealing airbag 43, and at least five dividing strips 433 connected to the outer wall of the main air cavity 431 are provided inside the auxiliary air cavity 432. The dividing strips 433 are inclined, and the main air cavity 431 can provide support for the sealing airbag 43 as a whole. The main air cavity 431 is located at the center of the sealing airbag 43 and is not easily damaged, thereby ensuring the overall structure of the sealing airbag 43. The dividing strip 433 can cooperate with the main air cavity 431 to provide support for the sealing airbag 43 as a whole, and on the other hand, can divide the internal space of the auxiliary air cavity 432 into a plurality of small chambers. When one of the small chambers is damaged, the other small chambers can still cooperate with the main air cavity 431 to support the sealing airbag 43 to seal the faucet, thereby greatly reducing the possibility of contamination of the flow channel due to damage to the sealing airbag 43.

[0049] If the sealing airbag 43 is damaged, it is necessary to replace the sealing airbag 43 in time. Therefore, the blocking block 47 is movably sleeved on the outside of the pull rod 44, and the outside of the pull rod 44 is also fixedly sleeved with an abutment piece 48 that fits with one side of the blocking block 47, and the end of the pull rod 44 is threadedly installed with an anti-drop cap 49 that fits with the other side of the blocking block 47. The anti-drop cap 49 and the abutment piece 48 can fix the blocking block 47 on the pull rod 44. When the sealing airbag 43 needs to be replaced, the anti-drop cap 49 is rotated to remove the sealing block 47 first, and then the sealing airbag 43 can be removed from the support 42. The connection method of the sealing airbag 43 and the support 42 can adopt other more convenient detachable connections such as threaded connection or clamping, which is convenient for replacing the sealing airbag 43.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A domain-controlled water-cooling plate faucet sealing device, comprising an integrally formed clamp (1) and a sealing cap (2) mounted on the outside thereof, characterized in that: The clamp (1) comprises two half clamps (101) that can be bent relative to each other, the sealing cap (2) is threadedly mounted on the outside of the two half clamps (101), and a sealing mechanism (4) is provided inside the sealing cap (2) for sealing the water nozzle from the inside. The sealing mechanism (4) comprises a spacer ring (41) fixedly mounted on the inner wall of the sealing cap (2), a support (42) fixedly mounted inside the spacer ring (41), a circular ring-shaped sealing airbag (43) mounted on one side of the support (42), a pull rod (44) coaxially arranged with the sealing airbag (43) slidably connected inside the sealing cap (2), one end of the pull rod (44) passes through the support (42) and the sealing airbag (43) in turn, and a blocking block (47) is installed to prevent foreign matter such as grinding fluid or steel needles from entering the domain control water cooling plate from the water nozzle, and a limiting member (45) is arranged outside the sealing cap (2) for fixing the pull rod (44).

2. The domain controlled water cooling plate faucet sealing device according to claim 1, characterized in that: An adaption groove (102) is arranged between the two half clamps (101), and a plurality of evenly distributed first springs (3) are fixedly installed inside the adaption groove (102), and a sub-buckle (103) is arranged at the bottom of one of the half clamps (101), and a female buckle (104) adapted to the sub-buckle (103) is arranged at the bottom of the other half clamp (101).

3. The domain controlled water cooling plate faucet sealing device according to claim 1, characterized in that: The limiting member (45) comprises a steering plate (451) fixedly mounted on the end of the pull rod (44) and an extension rod (452) fixedly mounted on the bottom of the sealing cap (2); one side of the extension rod (452) is provided with a plurality of limiting grooves (453) for the steering plate (451) to be inserted.

4. The domain controlled water cooling plate faucet sealing device according to claim 1, characterized in that: The two half clamps (101) are both provided with an anti-slip mechanism (5), the anti-slip mechanism (5) comprising a support rod (51) fixedly mounted on the side of the half clamp (101), the inner bottom wall and the inner top wall of the support rod (51) are both fixedly connected with a second spring (52), the end of the second spring (52) is fixedly connected with a clamping block (53) with a triangular cross section, the two clamping blocks (53) are symmetrically arranged, the two sides of the sealing cap (2) are both slidably connected with a bending rod (56), and the top and bottom of the bending rod (56) are both provided with a clamping groove (57) adapted to the clamping block (53).

5. The domain-controlled water-cooling plate faucet sealing device according to claim 4 is characterized in that: The end of the bending rod (56) is provided with a pointed head (58), the pointed head (58) is arranged between two clamping blocks (53), and the slope of the pointed head (58) is set to 15°-35°.

6. The domain-controlled water-cooling plate faucet sealing device according to claim 4, characterized in that: The side surfaces of the two clamping blocks (53) are both extended to the outside of the support rod (51) and are hingedly connected with a connecting rod (54). A connecting seat (55) is installed between the two connecting rods (54), and the ends of the two connecting rods (54) are rotatably installed on the connecting seat (55).

7. The domain controlled water cooling plate faucet sealing device according to claim 4, characterized in that: A transmission member (46) is provided between the pull rod (44) and the anti-slip mechanism (5), and the transmission member (46) includes a gear (461) slidably mounted on the outside of the pull rod (44), and the gear (461) is rotatably mounted at a central position of the outer wall of the sealing cap (2). The outer wall of the sealing cap (2) is also slidably mounted with two racks (462) meshing with the gear (461), and the two racks (462) are respectively arranged on the upper and lower sides of the gear (461), and the two bending rods (56) are respectively fixedly mounted on the ends of the two racks (462).

8. The domain-controlled water-cooling plate faucet sealing device according to claim 7, characterized in that: A third spring (463) is fixedly mounted on one end of the rack (462) facing away from the bending rod (56), and a fixing plate (464) is fixedly mounted on the end of the third spring (463), and the fixing plate (464) is fixedly mounted on the sealing cap (2).

9. The domain controlled water cooling plate faucet sealing device according to claim 1, characterized in that: The sealing airbag (43) is provided with a circular main air cavity (431) and an annular auxiliary air cavity (432) inside, and the auxiliary air cavity (432) is provided with at least five partition bars (433) connected to the outer wall of the main air cavity (431) inside.

10. The domain controlled water cooling plate faucet sealing device according to claim 1, characterized in that: The blocking block (47) is movably sleeved on the outside of the pull rod (44), and the outside of the pull rod (44) is also fixedly sleeved with a contact piece (48) that fits with one side of the blocking block (47), and the end of the pull rod (44) is threadedly installed with an anti-drop cap (49) that fits with the other side of the blocking block (47).

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