A refrigerator filter element that is easy to replace

Abstract

The present invention relates to the technical field of refrigerator filter elements, specifically a refrigerator filter element that is easy to replace, comprising a filter element housing, a fixing ring fixed to the inner wall of the filter element housing, a sloped surface provided on the fixing ring, a first guide track provided on the sloped surface, an annular guide groove provided on the inner wall of the annular guide groove, a first slider provided on the inner wall of the first slider, a first guide rod provided on the inner wall of the first slider, a ball provided on the end of the first guide rod, and the ball sliding in the first guide track. The refrigerator filter element that is easy to replace is installed at the air inlet of the refrigerator. When air enters the refrigerator air inlet, the turbine transmission fan blades are driven to rotate by the air flow passing through, so that the second guide rod can reciprocally knock the surface of the air filter element filter screen, causing the dust accumulated on the surface of the air filter element filter screen to vibrate and fall off.

Description

Technical Field

[0001] The invention relates to the technical field of refrigerator filter elements, and in particular to a refrigerator filter element that is easy to replace. Background Art

[0002] When the refrigerator is in use, the compressor needs to draw in outside air for air compression and refrigeration. Therefore, it is usually necessary to install a filter element at the air inlet of the refrigerator to filter out dust in the outside air before drawing it into the refrigerator.

[0003] During the use of the existing refrigerator filter elements on the market, the dust screen inside the filter element is usually easily clogged with impurities and dust every once in a while. Therefore, the dust screen position at the end of the filter element needs to be cleaned every once in a while, and the filter element needs to be replaced or cleaned regularly. Therefore, there is a need for a filter element that can automatically clean the clogged filter element end without frequent disassembly. Summary of the Invention

[0004] The present invention provides a refrigerator filter element that is easy to replace, which has the beneficial effects of preventing clogging and evenly filtering dust, and solves the problem mentioned in the above background technology that the dust screen in the filter element is easily clogged by impurities and dust every once in a while, so the dust screen at the end of the filter element needs to be cleaned every once in a while, and the filter element needs to be replaced or cleaned regularly. In order to achieve the above purpose, the present invention provides the following technical solutions: a refrigerator filter element that is easy to replace, comprising a filter element housing, a fixing ring is fixed to the inner wall of the filter element housing, a slope is provided on the fixing ring, a first guide rail is provided on the slope, an annular guide groove is provided on the inner wall of the first guide rail, a first slider is slidably provided on the inner wall of the annular guide groove, a first guide rod is slidably provided on the inner wall of the first slider, a ball is rotatably provided on the end of the first guide rod, and the ball slides in the first guide rail;

[0005] A fixed plate is fixed to one end of the first guide rod, a first return spring is sleeved on the outer wall of the first guide rod, one end of the first return spring is fixed to the outer wall of the first slider, the other end of the first return spring is fixed to the outer wall of the fixed plate, a second guide rod for knocking the air filter element filter screen is fixed to the outer wall of the fixed plate, and the movable plate is slidably arranged on the inner wall of the filter element housing.

[0006] As an optional solution for a refrigerator filter element that is easy to replace as described in the present invention, the outer wall of the filter element housing is provided with an air inlet, the inner wall of the air inlet is rotatably provided with a first rotating ring, a fixing rod is fixed on the first rotating ring, a turbine transmission fan blade is provided on the fixing rod, a connecting rod is fixed on the outer wall of the turbine transmission fan blade, and a rotating ball is fixed at one end of the connecting rod.

[0007] As an optional solution for an easily replaceable refrigerator filter element described in the present invention, a first fixed frame is fixed to the outer wall of the fixed plate, a groove for limiting the moving direction of the rotating ball is opened on the inner wall of the first fixed frame, and the outer contour of the connecting rod is matched with the inner contour of the first fixed frame.

[0008] As an optional solution for an easily replaceable refrigerator filter element according to the present invention, a plurality of evenly distributed protrusions for resisting the balls are fixed to the inner wall of the first guide track, and the protrusions are set to be hemispherical.

[0009] As an optional solution for an easily replaceable refrigerator filter element according to the present invention, a third guide rod is fixed to the fixed rod, a second rotating ring is fixed to one end of the third guide rod, the second rotating ring is rotatably arranged on the inner wall of the movable plate, a fourth guide rod is slidably arranged on the inner wall of the second rotating ring, and both ends of the fourth guide rod are fixed with a resistance block, and the end of the resistance block is configured as an arc shape;

[0010] A second guide rod is fixed on the second rotating ring, and the resistance block slides on the outer wall of the second guide rod. A second return spring is sleeved on the second guide rod, one end of the second return spring is fixed to the outer wall of the fourth guide rod, and the other end of the second return spring is fixed to the outer wall of the second rotating ring.

[0011] As an optional solution for an easily replaceable refrigerator filter element according to the present invention, a second fixing frame is fixed on the movable plate, and the abutment block abuts against an inner wall of the second fixing frame.

[0012] As an optional solution for a refrigerator filter element that is easy to replace as described in the present invention, wherein: a first air outlet is opened on the movable plate, two second fixed blocks are fixed on the movable plate, the outer walls of the two second fixed blocks are rotatably provided with a rotating rod, the outer wall of the rotating rod is fixed with a third fixed block, the outer wall of the third fixed block is fixed with an air induced baffle, and the outer contour of the air induced baffle is matched with the inner contour of the first air outlet.

[0013] As an optional solution for an easily replaceable refrigerator filter element according to the present invention, a torsion spring is sleeved on the rotating rod, and both ends of the torsion spring are respectively fixed to the outer walls of the third fixed block and the second fixed block.

[0014] As an optional solution for an easily replaceable refrigerator filter element according to the present invention, an air filter screen is installed inside the filter element housing, and a second air outlet is opened at the end of the filter element housing.

[0015] As an optional solution for an easily replaceable refrigerator filter element according to the present invention, a first fixing block is fixed to the filter element housing, and a fixing bolt is threadedly connected to the inner wall of the first fixing block.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the present invention, the filter element housing is installed at the air inlet of the refrigerator. When air enters the refrigerator air inlet, the turbine transmission fan blades are driven to rotate by the air flow passing through, so that the second guide rod can reciprocally knock the surface of the air filter element filter screen, causing the dust accumulated on the surface of the air filter element filter screen to be shaken off.

[0018] In the present invention, through the rotation of the turbine transmission fan blade, the second guide rod can continuously change the knocking position during the process of knocking the air filter element filter screen in a circular trajectory, so that the area of ​​the air filter element filter screen affected by the knocking is increased, and further knocking shakes off the dust accumulated on the surface of the air filter element filter screen.

[0019] In the present invention, the rotation of the turbine drive blades causes the reciprocating change in the rotation direction angle of the air inlet baffle, thereby changing the angle and range of the wind entering from the air inlet blowing toward the surface of the air filter element filter screen, so that the air entering from the air inlet can be blown more evenly to every place on the surface of the air filter element filter screen, making the air filter element filter screen more uniform in the filtering range of the incoming air. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 It is a schematic diagram of a top-view cross-sectional structure of the main body of the present invention;

[0022] Figure 3 It is a partial enlarged structural schematic diagram of the present invention;

[0023] Figure 4 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0024] Figure 5 A schematic diagram of a top view of the fixing ring and its surrounding structure of the present invention;

[0025] Figure 6 It is a schematic diagram of the front view structure of the fixing ring and its surroundings of the present invention;

[0026] Figure 7 For the present invention Figure 6 A in the middle is an enlarged structural diagram;

[0027] Figure 8 It is a schematic diagram of the front cross-sectional structure of the fixing ring and its surroundings of the present invention;

[0028] Figure 9 It is a schematic diagram of the enlarged structure of the movable plate and its surroundings of the present invention.

[0029] Reference numerals: 1, filter housing; 2, first fixing block; 3, fixing bolt; 4, air inlet; 5, first rotating ring; 6, fixing rod; 7, turbine transmission blade; 8, connecting rod; 9, rotating ball; 10, fixing ring; 11, inclined plane; 12, first guide rail; 13, protrusion; 14, annular guide groove; 15, first slider; 16, first guide rod; 17, ball bearing; 18, first return spring; 19, fixing plate; 20, second guide rod ; 21. First fixed frame; 22. Groove; 23. Third guide rod; 24. Movable plate; 25. Second rotating ring; 26. Second fixed block; 27. Rotating rod; 28. Third fixed block; 29. ​​Torsion spring; 30. Air baffle; 31. First air outlet; 36. Second fixed frame; 37. Fourth guide rod; 38. Second guide rod; 39. Resistance block; 40. Second return spring; 41. Air filter element; 42. Second air outlet. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0031] Example 1: This embodiment aims to solve the problem that the dust screen inside the existing refrigerator filter element on the market is easily clogged by impurities and dust during use. Therefore, the dust screen at the end of the filter element needs to be cleaned every once in a while, and the filter element needs to be replaced or cleaned regularly. Therefore, a filter element that can automatically clean the clogged filter element end without frequent disassembly is needed. Please refer to Figures 1-9 A refrigerator filter element that is easy to replace includes a filter element housing 1, a fixing ring 10 is fixed to the inner wall of the filter element housing 1, a bevel 11 is provided on the fixing ring 10, a first guide track 12 is provided on the bevel 11, an annular guide groove 14 is provided on the inner wall of the first guide track 12, a first slider 15 is slidably provided on the inner wall of the annular guide groove 14, a first guide rod 16 is slidably provided on the inner wall of the first slider 15, a ball 17 is rotatably provided on the end of the first guide rod 16, and the ball 17 slides in the first guide track 12;

[0032] A fixed plate 19 is fixed to one end of the first guide rod 16, and a first return spring 18 is sleeved on the outer wall of the first guide rod 16. One end of the first return spring 18 is fixed to the outer wall of the first slider 15, and the other end of the first return spring 18 is fixed to the outer wall of the fixed plate 19. A second guide rod 20 for knocking the air filter screen 41 is fixed to the outer wall of the fixed plate 19. A movable plate 24 is slidably arranged on the inner wall of the filter housing 1;

[0033] An air inlet 4 is formed on the outer wall of the filter housing 1. A first rotating ring 5 is rotatably provided on the inner wall of the air inlet 4. A fixing rod 6 is fixed to the first rotating ring 5. A turbine transmission blade 7 is provided on the fixing rod 6. A connecting rod 8 is fixed to the outer wall of the turbine transmission blade 7. A rotating ball 9 is fixed to one end of the connecting rod 8.

[0034] A first fixing frame 21 is fixed to the outer wall of the fixing plate 19. A groove 22 is formed on the inner wall of the first fixing frame 21 to limit the moving direction of the rotating ball 9. The outer contour of the connecting rod 8 matches the inner contour of the first fixing frame 21.

[0035] The inner wall of the first guide track 12 is fixed with a plurality of evenly distributed protrusions 13 for contacting the balls 17, and the protrusions 13 are set to be hemispherical;

[0036] An air filter screen 41 is installed inside the filter housing 1, and a second air outlet 42 is opened at the end of the filter housing 1;

[0037] A first fixing block 2 is fixed to the filter element housing 1, and a fixing bolt 3 is threadedly connected to the inner wall of the first fixing block 2;

[0038] Therefore, when using the filter element, first, insert the filter element housing 1 into the air inlet of the refrigerator, then screw the fixing bolt 3 into the first fixing block 2, and then screw the fixing bolt 3 through the first fixing block 2 into the threaded hole reserved outside the refrigerator air inlet to complete the fixing installation of the filter element housing 1;

[0039] Subsequently, during operation of the refrigerator, when the compressor begins to draw air from the outside, the airflow, when it reaches the compressor port, drives the turbine drive blades 7 to rotate. The turbine drive blades 7 then rotate, causing the connecting rod 8 to rotate synchronously. The connecting rod 8 is a square rod, and the outer contour of the connecting rod 8 matches the inner contour of the first fixing frame 21. Therefore, when the turbine drive blades 7 rotate with the connecting rod 8, the first fixing frame 21 and the fixing plate 19 rotate in a circular manner.

[0040] When the first guide rod 16 is moved, the first guide rod 16 will move synchronously with the first guide rail 12. Since the first guide rail 12 is provided with a plurality of evenly distributed protrusions 13, and the protrusions 13 are set as hemispherical protrusions, when the ball 17 moves and hits the protrusions 13, the ball 17 will slide and hit along the contour of the protrusions 13, prompting the ball 17 to slide along the first guide rod 16 in the first slider 15 in the direction away from the first guide rail 12, and move synchronously with the fixed plate 19 during the sliding process. The movement of the fixed plate 19 will stretch the first return spring 18 to facilitate subsequent reset. The movement of the fixed plate 19 will move synchronously with the second guide rod 20, and when the ball 17 slides completely through the surface of the protrusion 13, the first return spring 18 rebounds from the compressed state and resets the fixed plate 19 and the first guide rod 16.

[0041] Therefore, when the balls 17 slide over the multiple evenly distributed protrusions 13, the second guide rod 20 is prompted to strike the surface of the air filter screen 41 in a reciprocating circular motion trajectory. The knocking causes the dust in the gap blocked at the end of the air filter screen 41 to vibrate and then fall to the outside, thereby increasing the area of ​​the air filter screen 41 through which air can pass, thereby preventing excessive dust blockage and poor ventilation of the air filter screen 41.

[0042] The air filtered by the air filter element 41 enters the refrigerator through the second air outlet 42 for recycling;

[0043] The use time of the air filter element screen 41 after a single cleaning can be increased to the greatest extent, and the air filter element screen 41 needs to be disassembled and cleaned at longer intervals. When disassembling, the filter element housing 1 can be quickly removed as a whole by unscrewing and removing the bolt 3.

[0044] In this embodiment: by installing the filter housing 1 at the air inlet of the refrigerator, when air enters the refrigerator air inlet, the turbine transmission fan blades 7 are driven to rotate by the air flow passing through, so that the second guide rod 20 can reciprocally knock the surface of the air filter screen 41, causing the dust accumulated on the surface of the air filter screen 41 to be shaken off.

[0045] Example 2: This example aims to solve the problem of knocking the surface of the air filter element 41 on the basis of Example 1, and further remove the dust accumulated outside the air filter element 41. Figures 1-9 , an easy-to-replace refrigerator filter;

[0046] When the turbine drive blade 7 rotates and carries the first slider 15 to slide along the annular guide groove 14, since the first guide rail 12 is provided on the inclined surface 11, and the inclined surface 11 is the inclined surface of the surface of the fixed ring 10, the annular guide groove 14 provided in the first guide rail 12 is an inclined groove, which will cause the first slider 15 to change along the annular guide groove 14 as the inclination angle of the inclined surface 11 changes. The first guide rail 12 is also provided with a groove at an inclined angle on the inclined surface 11. At this time, when the ball 17 carries the first guide rod 16 to slide along the inner wall of the first slider 15 in the direction away from the first guide rail 12, the sliding of the first guide rod 16 causes the fixed plate 19 and the first fixed frame 21 to deflect along the outer wall of the rotating ball 9 by a certain angle, as shown in the attached figure. Figure 6 The status shown in;

[0047] When the first fixed frame 21 and the fixed plate 19 are deflected, the second guide rod 20 will be deflected synchronously with it. At this time, the direction of the second guide rod 20 will be changed. Therefore, in the process of the ball 17 sliding along the inclined first guide rail 12, the second guide rod 20 will be prompted to continuously change its direction. Combined with the second guide rod 20 in Example 1, when it moves in a circular motion, it knocks on the surface of the air filter element filter screen 41. On this basis, the second guide rod 20 will continue to change the knocking position to achieve a knocking effect on a larger area of ​​the air filter element filter screen 41.

[0048] In this embodiment: through the rotation of the turbine transmission fan blade 7, the second guide rod 20 can continuously change the knocking position during the process of knocking the air filter element filter 41 in a circular trajectory, so that the area of ​​the air filter element filter 41 surface affected by the knocking is increased, and further knocking shakes off the dust accumulated on the surface of the air filter element filter 41.

[0049] Example 3. This embodiment aims to solve the problem that the air inlet area of ​​the air inlet 4 is smaller than the cross-sectional area of ​​the air filter screen 41, which easily leads to the air inlet 4 being unable to be effectively filtered at the area where the surface of the air filter screen 41 is larger than the area of ​​the air inlet 4. The air will be concentrated at the position where the area of ​​the air inlet 4 overlaps, resulting in uneven utilization of the filtering position of the air filter screen 41, which is easy to cause blockage at a single position. Please refer to Figures 1-9 A refrigerator filter element that is easy to replace, a third guide rod 23 is fixed to the fixed rod 6, a second rotating ring 25 is fixed to one end of the third guide rod 23, the second rotating ring 25 is rotatably set on the inner wall of the movable plate 24, a fourth guide rod 37 is slidably set on the inner wall of the second rotating ring 25, and both ends of the fourth guide rod 37 are fixed with a resistance block 39, and the end of the resistance block 39 is set to an arc shape;

[0050] A second guide rod 38 is fixed to the second rotating ring 25. The abutment block 39 slides on the outer wall of the second guide rod 38. A second return spring 40 is sleeved on the second guide rod 38. One end of the second return spring 40 is fixed to the outer wall of the fourth guide rod 37, and the other end of the second return spring 40 is fixed to the outer wall of the second rotating ring 25.

[0051] The second fixed frame 36 is fixed on the movable plate 24 , and the abutment block 39 abuts against the inner wall of the second fixed frame 36 ;

[0052] A first air outlet 31 is formed on the movable plate 24. Two second fixing blocks 26 are fixed to the movable plate 24. A rotating rod 27 is rotatably provided on the outer wall of the two second fixing blocks 26. A third fixing block 28 is fixed to the outer wall of the rotating rod 27. An air induced baffle 30 is fixed to the outer wall of the third fixing block 28. The outer contour of the air induced baffle 30 matches the inner contour of the first air outlet 31.

[0053] A torsion spring 29 is sleeved on the rotating rod 27, and both ends of the torsion spring 29 are fixed to the outer walls of the third fixing block 28 and the second fixing block 26 respectively;

[0054] During the rotation of the turbine drive blade 7, the fixed rod 6 is rotated synchronously with it. During the rotation of the fixed rod 6, the third guide rod 23 is rotated in a circular manner. One end of the third guide rod 23 is connected to the second rotating ring 25. Therefore, the circumferential movement of the third guide rod 23 causes the second rotating ring 25 to rotate along the inside of the movable plate 24. The rotation of the second rotating ring 25 causes the fourth guide rod 37 to move in a circular manner.

[0055] The fourth guide rod 37 is moved in a circular manner, which causes the interference block 39 at one end of the fourth guide rod 37 to continuously slide along the inner contour of the second fixed frame 36. When the fourth guide rod 37 moves to both sides of the vertical inner wall of the inner contour of the second fixed frame 36, the interference block 39 will interfere with the inner wall of the second fixed frame 36. The interference causes the fourth guide rod 37 to slide along the inside of the second rotating ring 25 toward the position close to the air baffle 30. When sliding, the second return spring 40 is stretched to facilitate subsequent reset. The sliding of the fourth guide rod 37 causes the interference block 39 at the other end to gradually interfere with the air baffle The outer wall of the plate 30 is rotated, and the air induced baffle 30 is gradually pushed to rotate. When the air induced baffle 30 rotates, it rotates with the third fixed block 28. When the third fixed block 28 rotates, it drives the rotating rod 27 to rotate along the outer wall rotation connection of the second fixed block 26. During the rotation of the third fixed block 28, the torsion spring 29 is twisted to facilitate subsequent reset. The rotation of the air induced baffle 30 can change the angle at which the wind entering from the air inlet 4 blows to the surface of the air filter element filter screen 41. When the fourth guide rod 37 moves with the interference block 39 to interfere with the other horizontal edges of the inner wall of the second fixed frame 36, as shown in the attached Figure 9 As shown in FIG, at this time, the length of the fourth guide rod 37 is not enough to interfere with the air baffle 30.

[0056] In this embodiment, the rotation of the turbine drive blades 7 causes the reciprocating change in the rotation direction angle of the air inlet baffle 30, thereby changing the angle and range of the wind entering from the air inlet 4 blowing toward the surface of the air filter element filter 41, so that the air entering from the air inlet 4 can be blown more evenly to every place on the surface of the air filter element filter 41, making the air filter element filter 41 filter the incoming air more uniform.

[0057] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A refrigerator filter element that is easy to replace, comprising a filter element housing, characterized in that: A fixing ring is fixed to the inner wall of the filter element housing, and an inclined surface is provided on the fixing ring. A first guide track is provided on the inclined surface. An annular guide groove is provided on the inner wall of the first guide track. A first slider is slidably provided on the inner wall of the annular guide groove. A first guide rod is slidably provided on the inner wall of the first slider. A ball is rotatably provided on the end of the first guide rod, and the ball slides in the first guide track. An air filter screen is installed inside the filter housing, and a second air outlet is opened at the end of the filter housing; A fixed plate is fixed to one end of the first guide rod, a first return spring is sleeved on the outer wall of the first guide rod, one end of the first return spring is fixed to the outer wall of the first slider, and the other end of the first return spring is fixed to the outer wall of the fixed plate, a second guide rod for knocking the air filter screen is fixed to the outer wall of the fixed plate, and the movable plate is slidably arranged on the inner wall of the filter housing; An air inlet is formed on the outer wall of the filter housing, a first rotating ring is rotatably provided on the inner wall of the air inlet, a fixing rod is fixed on the first rotating ring, a turbine transmission blade is provided on the fixing rod, a connecting rod is fixed on the outer wall of the turbine transmission blade, a rotating ball is fixed on one end of the connecting rod, and the connecting rod is configured as a square rod; A first fixing frame is fixed to the outer wall of the fixing plate, and a groove is formed on the inner wall of the first fixing frame for limiting the moving direction of the rotating ball. The outer contour of the connecting rod matches the inner contour of the first fixing frame. A plurality of evenly distributed protrusions for resisting the balls are fixed to the inner wall of the first guide track, and the protrusions are set to be hemispherical.

2. The easily replaceable refrigerator filter element according to claim 1, characterized in that: A third guide rod is fixed on the fixed rod, a second rotating ring is fixed to one end of the third guide rod, the second rotating ring is rotatably arranged on the inner wall of the movable plate, a fourth guide rod is slidably arranged on the inner wall of the second rotating ring, and both ends of the fourth guide rod are fixed with a resistance block, and the end of the resistance block is set in an arc shape; A second guide rod is fixed on the second rotating ring, and the resistance block slides on the outer wall of the second guide rod. A second return spring is sleeved on the second guide rod, one end of the second return spring is fixed to the outer wall of the fourth guide rod, and the other end of the second return spring is fixed to the outer wall of the second rotating ring.

3. The easily replaceable refrigerator filter element according to claim 2, characterized in that: The second fixing frame is fixed on the movable plate, and the abutment block abuts against the inner wall of the second fixing frame.

4. The easily replaceable refrigerator filter element according to claim 3, characterized in that: A first air outlet is provided on the movable plate, two second fixed blocks are fixed on the movable plate, a rotating rod is rotatably provided on the outer walls of the two second fixed blocks, a third fixed block is fixed on the outer wall of the rotating rod, an air induced baffle is fixed on the outer wall of the third fixed block, and the outer contour of the air induced baffle matches the inner contour of the first air outlet.

5. The easily replaceable refrigerator filter element according to claim 4, characterized in that: A torsion spring is sleeved on the rotating rod, and two ends of the torsion spring are respectively fixed to the outer walls of the third fixing block and the second fixing block.

6. The easily replaceable refrigerator filter element according to claim 1, characterized in that: A first fixing block is fixed on the filter element housing, and a fixing bolt is threadedly connected to the inner wall of the first fixing block.

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