Permanent magnet cleaning machine capable of adjusting flow speed in grading mode

Abstract

The permanent magnet cleaning machine comprises a frame body, a high-pressure pump, a driving part and a spray gun, a water outlet is formed in the spray gun, a fixing block is arranged on the spray gun, a water passing hole is formed in the fixing block, a plurality of blocking columns are arranged on the fixing block, an end cover is slidably connected to the spray gun, and a through hole is formed in the end cover; and the end cover is rotationally connected with an adjusting ring. According to the requirements of different scenes such as large-area water spraying and fine water spraying, the end cover can be driven to slide by rotating the adjusting ring, so that the plugging column penetrates through / is separated from the through hole, graded adjustment of the water outlet range and the flow speed is achieved, the requirements of large-area and fine cleaning scenes are considered, and the applicability of the permanent magnet cleaning machine is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cleaning machines, in particular to a permanent magnet cleaning machine capable of adjusting flow rate in stages. BACKGROUND

[0002] The high-pressure cleaning machine is a machine that can strip and flush away dirt to clean the surface of an object by using a high-pressure plunger pump to generate high-pressure water.

[0003] For example, patent No. CN111604311A discloses a high-pressure cleaning machine, which comprises a vehicle frame, a high-pressure pump mounted on the vehicle frame, a spray gun connected to the water outlet of the high-pressure pump, a bracket fixedly installed on the vehicle frame, a gun seat fixedly installed on the top of the bracket for placing the spray gun, and a control system.

[0004] The above-mentioned high-pressure cleaning machine adopts a fixed spray head and can only realize a single water outlet range, which cannot meet the needs of different scenes such as large-area water spraying (such as ground and wall cleaning requiring wide coverage to improve efficiency) and fine water spraying (such as equipment bearing hole and gap cleaning requiring narrow coverage to prevent damage), and needs to be improved. SUMMARY

[0005] In order to solve the problem that the high-pressure cleaning machine cannot meet the needs of different scenes such as large-area water spraying and fine water spraying, the present application provides a permanent magnet cleaning machine capable of adjusting flow rate in stages.

[0006] The permanent magnet cleaning machine capable of adjusting flow rate in stages provided by the present application adopts the following technical solution:

[0007] The permanent magnet cleaning machine capable of adjusting flow rate in stages comprises a frame body, a high-pressure pump arranged on the frame body, a driving member, and a spray gun. The driving member drives the high-pressure pump to operate. The spray gun is provided with a water outlet. The spray gun is provided with a fixing block. The fixing block covers the water outlet. The fixing block is provided with a water passing hole. The fixing block is provided with a plurality of plugging columns. The plugging columns are located on the side of the fixing block away from the water outlet. The plugging columns are distributed in concentric circles around the central axis of the fixing block. The plugging columns extend from the center of the fixing block to the outer ring along the radial direction of the fixing block. The length of the plugging columns gradually increases. The lengths of the plugging columns located on the same circular track are consistent.

[0008] An end cover is slidably connected to the spray gun. The end cover is located at one end of the spray gun close to the water outlet and covers the fixing block. The end cover moves close to or away from the spray gun. The end cover is provided with a through hole. The through hole and the plugging columns correspond to each other. The through hole is provided for the plugging columns. The end cover is rotatably connected with an adjusting ring. The adjusting ring is threadedly connected with the spray gun.

[0009] By adopting the technical scheme, according to the requirements of different scenes such as large-area water spraying and fine water spraying, the end cover is driven to slide by rotating the adjusting ring, the blocking column is separated from the through hole, when the end cover is away from the spray gun, the blocking column is separated from the through hole from the inner ring to the outer ring in turn, a wide water outlet channel is formed, which is suitable for large-area water spraying scenes such as ground and wall surface; when the end cover is close to the spray gun, the outer ring long blocking column first penetrates the through hole to realize partial blocking, the inner ring through hole is in communication with the water passing hole, a narrow water outlet channel is formed, the water flow impact force (flow rate) is concentrated and increased, so as to remove stubborn impurities in the gap, which is suitable for fine water spraying scenes such as equipment bearing hole and gap, the grading adjustment of water outlet range and flow rate is realized, the requirements of large-area and fine cleaning scenes are considered, and the applicability of the permanent magnet cleaning machine is improved.

[0010] Optionally, a sleeve ring is slidably connected to the end cover, the sleeve ring is sleeved on the outer side of the end cover and slides close to or away from the adjusting ring, a plurality of elastic sheets are arranged on the adjusting ring, the elastic sheets are located on the side of the adjusting ring away from the end cover and are distributed around the outer periphery of the spray gun, the elastic sheet comprises a connecting portion arranged on the adjusting ring and a contact portion arranged on the connecting portion, the connecting portion and the outer wall of the spray gun are arranged in a spaced manner, the contact portion is located at one end of the connecting portion away from the adjusting ring and on the side of the connecting portion away from the spray gun, the contact portion is located on the movement path of the sleeve ring, and the end cover is provided with an elastic positioning member for positioning the sleeve ring.

[0011] By adopting the above technical scheme, when the water outlet range and flow rate need to be adjusted, the positioning state of the sleeve ring is released, the sleeve ring is moved away from the elastic sheet, and the adjusting ring is exposed, then the adjusting ring is rotated for adjustment, after the adjustment is completed, the sleeve ring is moved close to the adjusting ring and positioned, the sleeve ring extrudes the contact portion of the elastic sheet, the connecting portion is bent towards the outer wall of the spray gun, the connecting portion and the contact portion are connected, and the connecting portion is clamped into the threaded recess of the outer wall of the spray gun, thereby forming a limit and a double fixation with the threaded connection, avoiding displacement of the adjusting ring caused by vibration in the cleaning process to change the blocking state of the blocking column, thereby avoiding the sudden change of flow in the cleaning process to affect the cleaning effect, at this time, the sleeve ring covers the adjusting ring to form protection, blocks impurities from entering the threaded matching surface between the adjusting ring and the spray gun, thereby reducing the occurrence of threaded wear and jamming failure, and prolonging the service life of the spray gun and the adjusting ring.

[0012] Optionally, a positioning hole is provided on the outer wall of the collar, and a clearance groove is provided on the end cap. The elastic positioning member is located in the clearance groove. The elastic positioning member includes a fixing part on the end cap, a snap-fit ​​part on the fixing part, and an abutment part on the snap-fit ​​part. The abutment part is located on the side of the fixing part near the adjusting ring, and the snap-fit ​​part is located between the fixing part and the abutment part. The positioning hole allows the snap-fit ​​part to snap into, and the abutment part is used to abut against the inner ring wall of the collar.

[0013] By adopting the above technical solution, when it is necessary to move the collar, pressing the snap-fit ​​part causes the fixing part to deform, allowing the snap-fit ​​part to enter the relief groove and disengage from the positioning hole, thus moving the collar. When the water outlet range and flow rate are adjusted and the collar is moved close to the elastic plate, the collar squeezes the abutting part of the elastic plate, causing the connection between the connecting part and the abutting part to engage with the threaded recess on the outer wall of the spray gun, and the snap-fit ​​part and the positioning hole are aligned. The fixing part elastically resets, causing the snap-fit ​​part to engage with the positioning hole. The abutting part abuts against the inner ring wall of the collar to achieve limiting. At this time, the abutting part presses against the collar, so that the snap-fit ​​part presses against the inner wall of the positioning hole, thus positioning the collar. The operation is convenient, improves the operating efficiency, and meets the needs of single-person handheld spray gun quick switching during high-pressure cleaning.

[0014] Optionally, the abutting portion is provided with an abutting protrusion, which is located on the side of the abutting portion near the connecting portion and at the end of the abutting portion away from the connecting portion.

[0015] By adopting the above technical solution, the contact area with the collar is reduced, and the sliding extrusion force of the collar is concentrated on the abutting protrusion, ensuring that the collar only needs a small sliding thrust to drive the connecting part of the elastic sheet to bend toward the outer wall of the spray gun.

[0016] Optionally, the end cap is provided with a limiting block, and the collar is provided with a limiting groove. The limiting block is slidably connected to the limiting groove along the sliding direction of the collar.

[0017] By adopting the above technical solution, the collar moves along a predetermined direction through the sliding cooperation of the limiting block and the limiting groove, preventing circumferential rotation of the collar during sliding, and ensuring that the locking structure of the locking part engaging the positioning hole to position the collar can be triggered.

[0018] Optionally, the spray gun is provided with a limiting protrusion, and the end cap is provided with a limiting groove. The length direction of the limiting groove is parallel to the sliding direction of the end cap, and the limiting protrusion is located in the limiting groove.

[0019] By adopting the above technical solution, the end cap can move in a predetermined direction through the cooperation of the limiting protrusion and the limiting groove, thus avoiding circumferential rotation when the end cap slides, and thus avoiding misalignment between the sealing post on the fixing block and the through hole on the end cap due to the torsion of the end cap.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. According to the needs of different scenarios such as large-area water spraying and fine water spraying, the end cap can be slid by rotating the adjustment ring to allow the sealing column to pass through / disappear from the through hole, so as to realize the graded adjustment of water outlet range and flow rate, which takes into account the needs of large-area and fine cleaning scenarios and improves the applicability of permanent magnet cleaning machine.

[0022] 2. After adjustment, move the collar close to the adjusting ring and position it. The collar presses against the contact part of the elastic plate, so that the connection between the connecting part and the contact part is engaged in the threaded recess on the outer wall of the spray gun, forming a limit and forming a double fixation with the threaded connection. This prevents the adjusting ring from shifting due to vibration during the cleaning process and changing the sealing state of the sealing column, thereby avoiding sudden changes in flow rate during the cleaning process that may affect the cleaning effect. At the same time, the collar covers the adjusting ring to form protection, which helps to extend the service life of the spray gun and the adjusting ring.

[0023] 3. When it is necessary to move the collar, press the snap-fit ​​part to disengage it from the positioning hole, and then the collar can be moved. After the water outlet range and flow rate are adjusted and the collar is moved close to the elastic plate, the collar presses against the contact part of the elastic plate, causing the connection between the connecting part and the contact part to engage with the threaded recess on the outer wall of the spray gun, and the snap-fit ​​part and the positioning hole are aligned. The fixing part elastically resets, causing the snap-fit ​​part to engage with the positioning hole, thus positioning the collar. The operation is convenient and improves the efficiency of operation, which is suitable for the need for quick switching of a single person holding a spray gun during high-pressure cleaning. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an embodiment of this application.

[0025] Figure 2 This is a partial structural diagram of an embodiment of this application.

[0026] Figure 3 This is a partial exploded structural diagram of an embodiment of this application, mainly showing the structure of the water outlet, water passage hole and sealing column.

[0027] Figure 4 This is a partial structural diagram of an embodiment of this application, mainly showing the structure of the adjusting ring, the limiting block, and the elastic positioning element.

[0028] Figure 5 This is a partial structural diagram of an embodiment of this application, mainly showing the structure of the through hole and the limiting groove.

[0029] Figure 6 This is a partial structural diagram of an embodiment of this application, mainly showing the structure of the limiting groove.

[0030] Figure 7 for Figure 4 The enlarged view of section A mainly shows the structure of the elastic sheet and the abutment protrusion.

[0031] Explanation of reference numerals in the attached drawings: 1. Frame; 2. High-pressure pump; 3. Drive component; 4. Spray gun; 41. Water outlet; 5. Fixing block; 51. Water passage hole; 6. Sealing column; 7. End cap; 71. Through hole; 72. Limiting groove; 73. Relief groove; 8. Limiting protrusion; 9. Adjusting ring; 10. Collar; 101. Limiting groove; 102. Positioning hole; 11. Limiting block; 12. Elastic sheet; 121. Connecting part; 122. Abutting part; 14. Abutting protrusion; 15. Elastic positioning component; 151. Fixing part; 152. Snap-fitting part; 153. Abutting part. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0033] This application discloses a permanent magnet cleaning machine with adjustable flow rate in stages. See also... Figures 1-7 The permanent magnet cleaning machine with adjustable flow rate includes a frame 1, a high-pressure pump 2, a drive unit 3, and a spray gun 4. The high-pressure pump 2 and the drive unit 3 are both mounted on the frame 1. The drive unit 3 drives the high-pressure pump 2 to operate. In this embodiment, the drive unit 3 is a permanent magnet motor. The permanent magnet motor transmits power to the high-pressure pump 2 efficiently through a coupling (or gear transmission). It has the advantages of small size, high energy efficiency, stable speed, fast start-up, overload resistance, and low noise. It can ensure stable cleaning pressure and adapt to cleaning needs in multiple scenarios.

[0034] See Figures 1-7 The spray gun 4 is mounted on the frame 1. A water outlet 41 is provided on the end face of the spray gun 4. A fixing block 5 is fixed on the spray gun 4. The fixing block 5 covers the water outlet 41. Several water passage holes 51 are provided on the outer side wall of the fixing block 5 away from the spray gun 4. The several water passage holes 51 are evenly distributed in the circumferential direction along the outer periphery of the fixing block 5, and the water passage holes 51 and the water outlet 41 are connected.

[0035] See Figures 1-7 A number of sealing columns 6 are fixed on the fixed block 5. The sealing columns 6 are located on the side of the fixed block 5 away from the outlet 41. The sealing columns 6 are distributed in concentric circles around the central axis of the fixed block 5. The sealing columns 6 located on the same circular trajectory are evenly spaced around the central axis of the fixed block 5. Along the radial direction of the fixed block 5, they extend from the center of the fixed block 5 to the outer circle. The length of the sealing columns 6 gradually increases, and the length of the sealing columns 6 located on the same circular trajectory is consistent.

[0036] See Figures 1-7 An end cap 7 is slidably connected to the spray gun 4. The end cap 7 is located at the end of the spray gun 4 near the outlet 41 and covers the fixing block 5. The end cap 7 can move closer to or away from the spray gun 4. Several through holes 71 are opened on the end face of the end cap 7 away from the spray gun 4. The number and position of the through holes 71 correspond one-to-one with the number and position of the sealing posts 6. The through holes 71 allow the corresponding sealing posts 6 to pass through. A limiting protrusion 8 is fixed on the outer wall of the spray gun 4. A limiting groove 72 is opened on the outer wall of the end cap 7 near the spray gun 4. The length direction of the limiting groove 72 is parallel to the sliding direction of the end cap 7. The limiting protrusion 8 is located in the limiting groove 72. Through the cooperation of the limiting protrusion 8 and the limiting groove 72, the end cap 7 can move in a predetermined direction to prevent the end cap 7 from rotating circumferentially when sliding.

[0037] See Figures 1-7 An adjusting ring 9 is rotatably connected to the end cover 7. The adjusting ring 9 is located on the side of the end cover 7 close to the spray gun 4 and is sleeved on the outside of the spray gun 4. The rotation axis of the adjusting ring 9 and the end cover 7 is parallel to the sliding direction of the end cover 7. The adjusting ring 9 and the spray gun 4 are threadedly connected.

[0038] See Figures 1-7 A collar 10 is slidably connected to the end cover 7. The collar 10 is sleeved on the outside of the end cover 7 and slides closer to or away from the adjusting ring 9. The sliding direction of the collar 10 is parallel to the sliding direction of the end cover 7. A limiting block 11 is fixed on the outer wall of the end cover 7. A limiting groove 101 is opened on the inner ring wall of the collar 10. The limiting block 11 is slidably connected to the limiting groove 101 along the sliding direction of the collar 10. Through the sliding cooperation between the limiting block 11 and the limiting groove 101, the collar 10 moves in a predetermined direction to prevent circumferential rotation when the collar 10 slides.

[0039] See Figures 1-7A plurality of elastic plates 12 are fixed on the adjusting ring 9. The elastic plates 12 are located on the side of the adjusting ring 9 away from the end cap 7 and are evenly distributed circumferentially around the outer periphery of the spray gun 4. The elastic plates 12 are L-shaped. Each elastic plate 12 includes a connecting part 121 and a contact part 122. The connecting part 121 is fixed on the adjusting ring 9, and the connecting part 121 and the outer wall of the spray gun 4 are spaced apart, so that there is a gap between the connecting part 121 and the outer wall of the spray gun 4 to allow the connecting part 121 to bend and deform. The contact part 122 is located on the connecting part 121. The end of the contact part 122 away from the adjusting ring 9 and located on the side of the connecting part 121 away from the spray gun 4 is fixed together with the connecting part 121. The end of the contact part 122 away from the connecting part 121 extends out of the adjusting ring 9, so that the contact part 122 is located on the moving path of the collar 10. Each contact part 122 is fixed with a contact protrusion 14. The contact protrusion 14 is located on the side of the contact part 122 close to the connecting part 121 and on the end of the contact part 122 away from the connecting part 121. In this embodiment, the elastic sheet 12 is made of spring steel.

[0040] See Figures 1-7 Two positioning holes 102 are provided on the outer side wall of the collar 10, and the two positioning holes 102 are located on opposite sides of the collar 10. A relief groove 73 is provided on the outer side wall of the end cap 7. The number and position of the relief grooves 73 correspond one-to-one with the number and position of the positioning holes 102. An elastic positioning member 15 is provided on the end cap 7. The elastic positioning member 15 is used to position the collar 10. The number and position of the elastic positioning member 15 correspond one-to-one with the number and position of the relief grooves 73. Each elastic positioning member 15 is located within its corresponding relief groove 73. Each elastic positioning member 15 includes a fixing part 151, a snap-fit ​​part 152, and an abutment part 153. The fixing part 151 is located at the end of the relief groove 73 away from the adjusting ring 9, and the end of the fixing part 151 away from the adjusting ring 9 is fixedly connected to the end cover 7. The snap-fit ​​part 152 is fixed to the side of the fixing part 151 near the adjusting ring 9 and extends out of the groove of the relief groove 73. The positioning hole 102 is for the snap-fit ​​part 152 to snap into. The abutting part 153 is fixed to the side of the snap-fit ​​part 152 near the adjusting ring 9. The abutting part 153 is used to abut against the inner ring wall of the collar 10. The fixing part 151, the snap-fit ​​part 152 and the abutting part 153 are fixed as a whole. In this embodiment, the fixing part 151, the snap-fit ​​part 152 and the abutting part 153 are made of spring steel.

[0041] When it is necessary to rotate the adjusting ring 9, press the locking part 152. The fixing part 151 deforms, causing the locking part 152 to enter the relief groove 73 and disengage from the positioning hole 102, thus releasing the positioning state of the collar 10. Move the collar 10 away from the elastic plate 12 until the adjusting ring 9 is exposed, then rotate the adjusting ring 9 for adjustment. After adjustment, move the collar 10 closer to the adjusting ring 9. The collar 10 presses the abutting protrusion 14, which in turn presses the abutting part 122 of the elastic plate 12, causing the connecting part 121 to bend towards the outer wall of the spray gun 4. The connecting part 121 and the abutting part 122... The connection of part 2 will engage with the threaded recess on the outer wall of the spray gun 4 to form a limit, and form a double fixation with the threaded connection to prevent the adjusting ring 9 from being displaced by vibration during the cleaning process. When the engaging part 152 and the positioning hole 102 are aligned, the collar 10 covers the adjusting ring 9, and the fixing part 151 elastically resets and drives the engaging part 152 to engage with the positioning hole 102. The abutting part 153 abuts against the inner ring wall of the collar 10 to achieve the limit. At this time, the abutting part 122 abuts against the collar 10 through the abutting protrusion 14, so that the engaging part 152 abuts against the inner wall of the positioning hole 102 to position the collar 10.

[0042] The implementation principle of a permanent magnet cleaning machine with graded adjustable flow rate according to an embodiment of this application is as follows:

[0043] Depending on the needs of different scenarios such as large-area water spraying and fine water spraying, the end cap 7 can be slid by rotating the adjusting ring 9, so that the sealing column 6 passes through / disengages from the through hole 71. When the end cap 7 is away from the spray gun 4, the sealing column 6 disengages from the through hole 71 from the inner ring to the outer ring, forming a wide water outlet channel, which is suitable for large-area water spraying scenarios such as floors and walls. When the end cap 7 is close to the spray gun 4, the outer ring long sealing column 6 first passes through the through hole 71 to achieve partial sealing, and the inner ring through hole 71 is connected to the water passage hole 51 to form a narrow water outlet channel. The water flow impact force (flow velocity) is concentrated and increased to remove stubborn impurities in the gaps, which is suitable for fine water spraying scenarios such as equipment bearing holes and gaps. It realizes graded adjustment of water outlet range and flow velocity, taking into account the needs of large-area and fine cleaning scenarios, and improving the applicability of permanent magnet cleaning machine.

[0044] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A permanent magnet cleaning machine with adjustable flow rate in stages, comprising a frame (1), a high-pressure pump (2) mounted on the frame (1), a drive unit (3), and a spray gun (4), wherein the drive unit (3) drives the high-pressure pump (2) to operate, and the spray gun (4) is provided with a water outlet (41), characterized in that: The spray gun (4) is provided with a fixing block (5), which covers the water outlet (41). The fixing block (5) has a water passage hole (51) and a plurality of sealing columns (6) are provided on the fixing block (5). The sealing columns (6) are located on the side of the fixing block (5) away from the water outlet (41), and the plurality of sealing columns (6) are distributed in concentric circles around the central axis of the fixing block (5). They extend from the center of the fixing block (5) outward along the radial direction of the fixing block (5). The length of the sealing columns (6) gradually increases, and the lengths of the sealing columns (6) located on the same circular trajectory are consistent. An end cap (7) is slidably connected to the spray gun (4). The end cap (7) is located at the end of the spray gun (4) near the outlet (41) and covers the fixing block (5). The end cap (7) can move closer to or away from the spray gun (4). A through hole (71) is provided on the end cap (7). The through hole (71) corresponds one-to-one with the sealing column (6). The through hole (71) allows the sealing column (6) to pass through. An adjusting ring (9) is rotatably connected to the end cap (7). The adjusting ring (9) is threadedly connected to the spray gun (4).

2. The permanent magnet cleaning machine with graded adjustable flow rate according to claim 1, characterized in that: A collar (10) is slidably connected to the end cap (7). The collar (10) is fitted onto the outside of the end cap (7) and slides closer to or away from the adjusting ring (9). The adjusting ring (9) is provided with a plurality of elastic pieces (12). The elastic pieces (12) are located on the side of the adjusting ring (9) away from the end cap (7) and are distributed around the outer periphery of the spray gun (4). The elastic piece (12) includes a connecting part (121) provided on the adjusting ring (9) and a connecting part (121) provided on the adjusting ring (9). The connecting part (121) has an abutting part (122) on it. The connecting part (121) and the outer wall of the spray gun (4) are spaced apart. The abutting part (122) is located at one end of the connecting part (121) away from the adjusting ring (9) and on the side of the connecting part (121) away from the spray gun (4). The abutting part (122) is located on the moving path of the collar (10). The end cover (7) is provided with an elastic positioning member (15) for positioning the collar (10).

3. The permanent magnet cleaning machine with adjustable flow rate according to claim 2, characterized in that: The outer side wall of the collar (10) is provided with a positioning hole (102), and the end cap (7) is provided with a relief groove (73). The elastic positioning member (15) is located in the relief groove (73). The elastic positioning member (15) includes a fixing part (151) provided on the end cap (7), a snap-fit ​​part (152) provided on the fixing part (151), and an abutment part (153) provided on the snap-fit ​​part (152). The abutment part (153) is located on the side of the fixing part (151) close to the adjusting ring (9). The snap-fit ​​part (152) is located between the fixing part (151) and the abutment part (153). The positioning hole (102) is for the snap-fit ​​part (152) to be snapped into. The abutment part (153) is used to abut against the inner ring wall of the collar (10).

4. The permanent magnet cleaning machine with graded adjustable flow rate according to claim 3, characterized in that: The contact portion (122) is provided with a contact protrusion (14), which is located on the side of the contact portion (122) close to the connecting portion (121) and at the end of the contact portion (122) away from the connecting portion (121).

5. The permanent magnet cleaning machine with graded adjustable flow rate according to claim 2, characterized in that: The end cap (7) is provided with a limiting block (11), and the collar (10) is provided with a limiting groove (101). The limiting block (11) is slidably connected to the limiting groove (101) along the sliding direction of the collar (10).

6. The permanent magnet cleaning machine with graded adjustable flow rate according to claim 1, characterized in that: The spray gun (4) is provided with a limiting protrusion (8), and the end cap (7) is provided with a limiting groove (72). The length direction of the limiting groove (72) is parallel to the sliding direction of the end cap (7), and the limiting protrusion (8) is located in the limiting groove (72).

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