Adjustable intelligent paint spraying device for automobile repair

Abstract

The application discloses an adjustable intelligent paint spraying device for automobile repair, which comprises a spray gun body, the spray gun body is provided with a spray pipe and a holding part, an air inlet cavity is formed in the spray pipe, the holding part is connected with an air pressure source, the air pressure source is communicated with the air inlet cavity, the outer end surface of the spray pipe is provided with an adsorbed floating paint particle protection assembly, a negative pressure mechanism for supplying pressure for the protection assembly is arranged on the inner wall of the air inlet cavity, a spray head and a paint pot are communicated with the end of the air inlet cavity away from the air pressure source, the protection assembly comprises a collecting layer, a separation layer and a support rod, the support rod is provided with a plurality of groups, the plurality of groups of support rods are rotationally connected to the outer end surface of the spray pipe, the separation layer is arranged between the support rods, and one end of the collecting layer is sleeved with the outer end surface of the spray pipe. The device can be suitable for manual paint repair in automobile repair, the protection assembly is combined with the spray gun, is convenient to carry and use, paint particles in the air can be collected during use through the protection assembly, and the harm to the user is reduced.

Description

Technical Field

[0001] This invention relates to the field of spray painting equipment technology, and in particular to an adjustable intelligent spray painting device for automotive repair. Background Technology

[0002] Automotive painting refers to applying a layer of paint to the surface of a car to protect it. Automotive painting typically uses baking paint. In car manufacturing plants, after the frame and body shell are welded, the next step is painting. Types of paint include regular paint, metallic paint, and pearlescent paint. The automotive painting process includes: puttying, sanding, and painting. Various solvents used in painting contain benzene and benzene compounds, such as toluene and xylene. Common industrial solvents used as thinners, such as ethanol and butanol, are also toxic, and some are even highly toxic, such as methanol. The presence of these toxic substances can harm the nervous system, respiratory system, and skin, most commonly causing benzene poisoning and paint poisoning. During the painting process, large amounts of volatile gases are frequently generated and diffused into the air. Inhaling these large amounts of toxic, hot gases can cause nervous system disorders, typically manifesting as dizziness, palpitations, nausea, and vomiting. Frequent contact of fingers and other parts of the body with various solvents and toxic gases can also cause skin corrosion, degreasing, itching, roughness, and cracking.

[0003] Chinese Patent Publication CN107930901A discloses a protective cover for a spray gun of a spraying machine, including a connecting sleeve fitted onto the spray gun and a cover structure disposed on the connecting sleeve. The connecting sleeve includes an upper connecting sleeve and a lower connecting sleeve, which can be spliced ​​together to form a cylindrical connecting sleeve. External threads are provided on the upper and lower connecting sleeves. The cover structure includes a conical cover and a connecting part connected to the conical cover. The connecting part is a hollow cylindrical structure, and the connecting part can be screwed into the connecting sleeve through its internal threads. This invention can be fixed to the spray gun by the connecting sleeve, and the conical cover is connected to the connecting sleeve through its connecting part, which facilitates the fixation of the protective cover. The connecting part can rotate and move on the connecting sleeve through the threads, which facilitates the adjustment of the distance between the protective cover and the nozzle outlet of the spray gun. By providing elastic clamping elements in the upper and lower connecting sleeves, it can accommodate spray guns of different diameters.

[0004] In the process of car repair and paint touch-up, local spraying is often required using a spray gun. During the spraying process, a large amount of paint is released into the air and can be easily inhaled by the user. A protective cover can be installed on the spray gun, but the cover will block the view and cannot actively capture paint particles in the air. In addition, the cover is assembled and connected, making installation and disassembly cumbersome.

[0005] Therefore, it is necessary to provide an adjustable intelligent paint spraying device for automotive repair to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide an adjustable intelligent paint spraying device for automotive repair to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an adjustable intelligent paint spraying device for automotive repair, comprising a spray gun body, the spray gun body having a spray pipe and a grip, an air inlet chamber being provided inside the spray pipe, the grip being connected to an air pressure source, the air pressure source being connected to the air inlet chamber, a protective component for adsorbing floating paint particles being provided on the outer end face of the spray pipe, a negative pressure mechanism for supplying pressure to the protective component being provided on the inner wall of the air inlet chamber, and a nozzle and a paint can being connected to the end of the air inlet chamber away from the air pressure source.

[0008] As a further embodiment of the present invention, the protective component includes a collection layer, a partition layer, and a support rod. The support rod is provided in multiple sets, and the multiple sets of support rods are rotatably connected to the outer end face of the nozzle. The partition layer is disposed between the support rods. One end of the collection layer is sleeved on the outer end face of the nozzle. The end of the collection layer away from the nozzle is connected to the end of the support rod. The support rod is provided with an air hole on the side facing the collection layer. The support rod is hollow inside and communicates with the negative pressure mechanism.

[0009] Furthermore, the separating layer can be made of transparent material to reduce the obstruction and impact of the device on the user, the collecting layer can be made of filter material such as cotton cloth or mesh, the separating layer can be arc-shaped, and the separating layer can adopt a folding or telescopic structure to increase its unfolded area.

[0010] As a further embodiment of the present invention, the outer end face of the nozzle is provided with a paint can for fixing the collection layer, the end of the collection layer opposite to the nozzle is provided with a first magnetic absorbing piece adapted to the support rod, and the nozzle is provided with a slot adapted to the paint can.

[0011] Furthermore, the nozzle is made of metal.

[0012] As a further embodiment of the present invention, a rotating shaft is provided at the lower part of the side end face of the support rod, the nozzle has a rotating cavity adapted to the support rod, and the bottom of the support rod is fitted with the negative pressure mechanism.

[0013] Furthermore, the outer end face of the support rod is provided with a limiting protrusion, and the inner wall of the rotating cavity is provided with a limiting groove that matches the limiting protrusion. Thus, the position of the support rod can be positioned by the protrusion to prevent the support rod from moving, or the rotating shaft can be set as a damping rotating shaft.

[0014] As a further embodiment of the present invention, the negative pressure mechanism is annular, and both ends of the negative pressure mechanism are elastically fitted to the interior of the air intake chamber through a first elastic element. The negative pressure mechanism includes multiple sets of guide plates, and a second elastic element is filled between the guide plates.

[0015] As a further embodiment of the present invention, the guide plate is provided with a limiting groove adapted to the support rod, the bottom of the limiting groove is provided with a negative pressure groove, the bottom of the support rod is provided with a cut surface that fits with the negative pressure groove, and the bottom of the support rod passes through and is adapted to the negative pressure groove. A limiting rod is fixedly connected to the outer end face of the guide plate, the limiting rod is slidably connected to the inside of the nozzle, and the negative pressure groove is inclined along the air outlet direction of the air inlet chamber.

[0016] As a further embodiment of the present invention, a sealing plate is attached to the upper surface of the negative pressure groove, a sliding groove is provided on one side of the inner wall of the limiting inclined groove, the sealing plate is elastically embedded in the sliding groove, and an abutment block is fixedly connected to the end of the sealing plate away from the sliding groove.

[0017] In use, this invention involves rotating the support rod during the painting process, causing it to unfold. Simultaneously, the collection layer and the separator layer stretch and expand, extending the collection layer to the area between the end of the support rod and the nozzle. This allows the device to capture airborne paint particles, reducing the user's risk of inhaling them. The separator layer, formed between the support rods, further impedes airborne paint particles. The support rods are connected to a negative pressure mechanism via vents. Under the separation of the separator layer, the interior of the separator layer is under slight negative pressure, allowing air to pass through the collection layer and enter its interior. This significantly improves the device's ability to collect airborne paint particles. The protective component, located on the outer end of the nozzle, maximizes the capture of airborne paint particles, enhancing the device's protective effect on the user and preventing paint particles from scattering during painting. Furthermore, when the support rod is retracted, the collection layer is contained within the separator layer, and the support rod and separator layer protect the collection layer from external environmental contamination. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

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

[0020] Figure 2 This is a schematic diagram of the protective component structure of the present invention;

[0021] Figure 3 This is the invention Figure 1 Enlarged structural diagram at point A in the middle;

[0022] Figure 4 This is a schematic diagram of the structure in use of the present invention;

[0023] Figure 5 This is a schematic diagram of the strut structure of the present invention;

[0024] Figure 6 This is the invention Figure 2 Enlarged structural diagram at point B;

[0025] Figure 7 This is a schematic diagram of the negative pressure mechanism of the present invention;

[0026] Figure 8 This is a schematic diagram of the protective component of the present invention in its retracted state;

[0027] Figure 9 This is a schematic diagram of the overall structure of the conductive plate in the conductive state of the present invention;

[0028] Figure 10 This is a schematic diagram of the closed state structure of the conductive plate of the present invention;

[0029] Figure 11 This is the invention Figure 4 Enlarged structural diagram at point C;

[0030] Figure 12 This is the invention Figure 4 Enlarged structural diagram at point D.

[0031] In the diagram: 1. Spray gun body; 2. Protective components; 3. Spray nozzle; 4. Air inlet chamber; 5. Grip; 6. Air pressure source; 7. First elastic element; 8. Negative pressure mechanism; 9. Collection layer; 10. Paint can; 11. Spray head; 12. Separating layer; 13. Support rod; 14. Air hole; 15. First magnetic suction plate; 16. Rotating cavity; 17. Limiting rod; 18. Guide plate; 19. Rotating shaft; 20. Limiting groove; 21. Negative pressure groove; 22. Sealing plate; 23. Abutment block; 24. Second elastic element; 25. Sliding groove. Detailed Implementation

[0032] Example 1

[0033] like Figure 1 As shown, an adjustable intelligent paint spraying device for automotive repair includes a spray gun body 1. The spray gun body 1 is provided with a spray pipe 3 and a grip 5. An air inlet chamber 4 is opened inside the spray pipe 3. An air pressure source 6 is connected to the grip 5. The air pressure source 6 is connected to the air inlet chamber 4. A protective component 2 for adsorbing floating paint particles is provided on the outer end face of the spray pipe 3. A negative pressure mechanism 8 for supplying pressure to the protective component 2 is provided on the inner wall of the air inlet chamber 4. A nozzle 11 and a paint can 10 are connected to the end of the air inlet chamber 4 away from the air pressure source 6.

[0034] like Figure 1 - Figure 2 , Figure 4 - Figure 5 and Figure 8As shown, the protective component 2 includes a collection layer 9, a partition layer 12, and a support rod 13. Multiple sets of support rods 13 are provided, and the multiple sets of support rods 13 are rotatably connected to the outer end face of the nozzle 3. The partition layer 12 is disposed between the support rods 13. One end of the collection layer 9 is sleeved on the outer end face of the nozzle 3. The end of the collection layer 9 away from the nozzle 3 is connected to the end of the support rod 13. The support rod 13 is provided with an air hole 14 on the side facing the collection layer 9. The support rod 13 is hollow inside and communicates with the negative pressure mechanism 8.

[0035] Furthermore, the partition layer 12 can be made of transparent material to reduce the obstruction and impact of the device on the user, the collection layer 9 can be made of filter material such as cotton cloth or mesh, the partition layer 12 can be arc-shaped, and the partition layer 12 can adopt a folding or telescopic structure to increase its unfolded area.

[0036] During use, rotating the support rod 13 during the painting process unfolds it. This unfolding of the support rod 13 stretches the collecting layer 9 and the separating layer 12, extending the collecting layer 9 to the area between the end of the support rod 13 and the spray nozzle 3. This allows the device to capture airborne paint particles, reducing the user's inhalation of these particles. Simultaneously, the separating layer 12, formed between the support rods 13, blocks airborne paint particles. The support rod 13 is connected to a negative pressure mechanism 8 via air vents 14. Under the separation of the separating layer 12, the interior of the separating layer 12... The negative pressure mechanism 8 is thus in a slightly negative pressure state, which allows air gas to enter the interior of the separator layer 12 through the collection layer 9, thereby greatly improving the device's collection of airborne paint particles. The protective component 2, located on the outer end face of the nozzle 3, can maximize the capture of airborne paint particles, thereby improving the device's protective effect on the user and preventing paint particles from scattering everywhere during the painting process. In the retracted state, the support rod 13 can retract the collection layer 9 into the separator layer 12. The support rod 13 and the separator layer 12 protect the collection layer 9 from external environmental pollution.

[0037] Example 2

[0038] Based on Example 1, such as Figure 1 - Figure 2 , Figure 5 - Figure 6 and Figure 12 As shown, the outer end face of the nozzle 3 is provided with a paint can 10 for fixing the collection layer 9, and the end of the collection layer 9 away from the nozzle 3 is provided with a first magnetic piece 15 that is adapted to the support rod 13. The nozzle 3 is provided with a slot that is adapted to the paint can 10.

[0039] Furthermore, nozzle 3 is made of metal.

[0040] In use, the collection layer 9 is connected to the support rod 13 and the spray pipe 3 via the first magnetic clasp 15 and the paint pot 10, respectively. The spray pipe 3 has a slot that matches the paint pot 10. By placing the collection layer 9 inside the slot, the collection layer 9 is fixed in the slot by the magnetic adhesion of the paint pot 10. The outer periphery of the collection layer 9 is magnetically attached to the end of the support rod 13 via the first magnetic clasp 15, which limits the outer periphery of the collection layer 9. This allows the collection layer 9 to unfold as the support rod 13 rotates. The setting of the paint pot 10 and the first magnetic clasp 15 makes the installation and removal of the collection layer 9 more convenient, and it is easy for the user to remove the collection layer 9 for cleaning after use.

[0041] like Figure 1 - Figure 5 and Figure 11 As shown, a rotating shaft 19 is provided on the lower part of the side end face of the support rod 13, and the nozzle 3 has a rotating cavity 16 adapted to the support rod 13. The bottom of the support rod 13 is fitted with the negative pressure mechanism 8.

[0042] Furthermore, the outer end face of the support rod 13 is provided with a limiting protrusion, and the inner wall of the rotating cavity 16 is provided with a limiting groove that matches the limiting protrusion. Thus, the position of the support rod 13 can be positioned by the protrusion to prevent the support rod 13 from moving. Alternatively, the rotating shaft 19 can be set as a damping rotating shaft.

[0043] like Figure 1 - Figure 4 and Figure 7 As shown, the negative pressure mechanism 8 is ring-shaped, and the two ends of the negative pressure mechanism 8 are elastically fitted to the inside of the air intake chamber 4 through the first elastic element 7. The negative pressure mechanism 8 includes multiple sets of guide plates 18, and the space between the guide plates 18 is filled with a second elastic element 24.

[0044] In use, the guide plate 18 and the second elastic element 18 form a ring, and at the same time, under the action of the first elastic element 7, they keep in contact with the inner wall of the air intake cavity. When the support rod 13 rotates, the guide plate 18 will abut against each other, and the guide plates 18 are connected by the second elastic element 24. While maintaining the airtightness of the negative pressure mechanism 8, the second elastic element 24 can be compressed to a certain extent as the guide plate 18 moves, so as to avoid interference with the rotation of the support rod 13.

[0045] like Figure 1 - Figure 4 and Figure 7 As shown, the guide plate 18 has a limiting groove 20 that matches the support rod 13. The bottom of the limiting groove 20 has a negative pressure groove 21. The bottom of the support rod 13 has a cut surface that fits with the negative pressure groove 21, and the bottom of the support rod 13 is through and matches the negative pressure groove 21. The outer end face of the guide plate 18 is fixedly connected to a limiting rod 17. The limiting rod 17 is slidably connected inside the nozzle 3, and the negative pressure groove 21 is inclined along the air outlet direction of the air inlet chamber 4.

[0046] During use, since the guide plate 18 is elastically attached to the inner wall of the air inlet chamber 4, a high-speed airflow flows inside the air inlet chamber 4 when the device is spraying paint. Since the negative pressure groove 21 is inclined to the air outlet direction of the air inlet chamber 4, the flow of gas inside the air inlet chamber 4 will cause a vacuum or negative pressure state to be generated inside the negative pressure groove 21. The support rod 13 rotates along the rotating shaft 19, and the rotating shaft 19 is attached to the limiting inclined groove 20. As the support rod 13 continues to rotate, when the bottom cut surface of the support rod 13 is attached to the upper surface of the negative pressure groove 21, the negative pressure groove 21 is connected to the inside of the support rod 13. Thus, the air holes 14 on the surface of the support rod 13 create negative pressure inside the separation layer 12, so that the protective component 2 can adsorb air and capture the corresponding paint particles through the collection layer 9, reducing the user's inhalation of paint. The guide plate 18 is provided with a limiting rod 17 to prevent the support rod 13 from driving the negative pressure mechanism 8 to move laterally when rotating. The limiting rod 17 limits the guide plate 18.

[0047] like Figure 1 - Figure 4 and Figure 9 - Figure 11 As shown, a sealing plate 22 is attached to the upper surface of the negative pressure groove 21, and a sliding groove 25 is provided on one side of the inner wall of the limiting inclined groove 20. The sealing plate 22 is elastically embedded in the sliding groove 25, and an abutment block 23 is fixedly connected to the end of the sealing plate 22 away from the sliding groove 25.

[0048] In use, when the support rod 13 is in the retracted state, the sealing plate 22 seals the negative pressure groove 21 under the elastic force of the elastic element inside the sliding groove 25, preventing external gas from entering the interior of the nozzle 3. As the support rod 13 rotates, the end of the support rod 13 elastically fits against the abutment block 23. With the rotation of the support rod 13, the support rod 13 presses against the abutment block 23, causing the sealing plate 22 to slide inside the sliding groove 25 until the support rod 13 and the negative pressure groove 21 are connected and the support rod 13 fits against the upper surface of the negative pressure groove 21. At this time, the negative pressure inside the negative pressure groove 21 can be transmitted to the interior of the partition layer 12 through the support rod 13.

[0049] Working Principle: During the painting process, rotating the support rod 13 causes it to unfold. Simultaneously, the collection layer 9 and the separator layer 12 are stretched and extended. The collection layer 9 extends to the area between the end of the support rod 13 and the spray nozzle 3, allowing the device to capture airborne paint particles, reducing the user's inhalation of these particles. Simultaneously, the separator layer 12 forms between the support rods 13, blocking airborne paint particles. The support rod 13 is connected to a negative pressure mechanism 8 through air holes 14. Due to the separation of the separator layer 12, the interior of the separator layer 12 is under a slight negative pressure state, allowing air to pass through the collection layer 9 and enter the interior of the separator layer 12, thus greatly improving the device's ability to capture airborne particles. The device collects stray paint particles, and the protective component 2, located on the outer end face of the nozzle 3, maximizes the capture of stray paint particles, thereby improving the device's protective effect on the user and preventing stray paint particles from scattering during the painting process. Furthermore, when the support rod 13 is in the retracted state, it can retract the collection layer 9 inside the partition layer 12. The support rod 13 and the partition layer 12 protect the collection layer 9 from external environmental contamination. The collection layer 9 is connected to the support rod 13 and the nozzle 3 via the first magnetic clasp 15 and the paint container 10, respectively. The nozzle 3 has a slot adapted to the paint container 10. By placing the collection layer 9 inside the slot, the paint container 10 magnetically attaches it, fixing the collection layer 9 within the slot. The outer periphery of the collection layer 9 is secured by the first magnetic clasp 15. 5 magnetically attaches to the end of the support rod 13, limiting the periphery of the collection layer 9, so that the collection layer 9 can unfold as the support rod 13 rotates. The setting of the paint can 10 and the first magnetic piece 15 makes the installation and removal of the collection layer 9 convenient, allowing the user to remove the collection layer 9 for cleaning after use. The guide plate 18 and the second elastic member 18 form a ring, and under the action of the first elastic member 7, they keep in contact with the inner wall of the air intake cavity. When the support rod 13 rotates, the guide plates 18 will abut against each other, and the guide plates 18 are connected by the second elastic member 24. While maintaining the airtightness of the negative pressure mechanism 8, the second elastic member 24 can be compressed to a certain extent as the guide plate 18 moves, avoiding interference with the rotation of the support rod 13. The outer end face of the support rod 13 is provided with A limiting protrusion is provided, and a limiting groove adapted to the limiting protrusion is provided on the inner wall of the rotating cavity 16. The position of the support rod 13 can be positioned by the protrusion to prevent the support rod 13 from moving. Alternatively, the rotating shaft 19 can be set as a damping rotating shaft. Since the guide plate 18 is elastically attached to the inner wall of the air inlet cavity 4, a high-speed airflow flows inside the air inlet cavity 4 when the device is being painted. Since the negative pressure groove 21 is inclined to the air outlet direction of the air inlet cavity 4, the flow of gas inside the air inlet cavity 4 will cause a vacuum or negative pressure state to be generated inside the negative pressure groove 21. The support rod 13 rotates along the rotating shaft 19, and the rotating shaft 19 is attached to the limiting inclined groove 20. As the support rod 13 continues to rotate, when the bottom cut surface of the support rod 13 is attached to the upper surface of the negative pressure groove 21, the negative pressure groove 21 is connected to the inside of the support rod 13.The air pores 14 on the surface of the support rod 13 create negative pressure inside the partition layer 12, allowing the protective component 2 to adsorb air and capture paint particles through the collection layer 9, reducing the user's inhalation of paint. The guide plate 18 is equipped with a limiting rod 17 to prevent the support rod 13 from moving laterally when rotating. The limiting rod 17 limits the guide plate 18. When the support rod 13 is in the contracted state, the sealing plate 22 closes the negative pressure groove 21 under the elastic force of the elastic element inside the sliding groove 25, preventing external gas from entering the nozzle 3. As the support rod 13 rotates, the end of the support rod 13 elastically fits against the abutment block 23. With the rotation of the support rod 13, the support rod 13 presses the abutment block 23, causing the sealing plate 22 to slide inside the sliding groove 25 until the support rod 13 connects with the negative pressure groove 21 and the upper surface of the support rod 13 fits against the negative pressure groove 21. At this time, the negative pressure inside the negative pressure groove 21 can be transmitted to the interior of the partition layer 12 through the support rod 13. ,

Claims

1. An adjustable intelligent paint spraying device for automobile repair, comprising a spray gun body provided with a spray pipe and a holding part, an air inlet cavity is formed in the spray pipe, and an air pressure source is connected to the holding part, characterized in that: The air pressure source is communicated with the air inlet cavity, the outer end surface of the spray pipe is provided with an adsorbed floating paint particle protection assembly, the inner wall of the air inlet cavity is provided with a negative pressure mechanism for supplying pressure to the protection assembly, and the end of the air inlet cavity away from the air pressure source is communicated with a spray head and a paint pot. The protection assembly comprises a collection layer, a separation layer and a support rod, the support rod is provided in multiple groups, the multiple groups of support rods are rotationally connected to the outer end surface of the spray pipe, the separation layer is arranged between the support rods, one end of the collection layer is sleeved on the outer end surface of the spray pipe, the end of the collection layer away from the spray pipe is connected with the end portion of the support rod, and the side of the support rod towards the collection layer is provided with air holes, the support rod is hollow inside and communicated with the negative pressure mechanism. The lower part of the side end surface of the support rod is provided with a rotating shaft, the spray pipe is provided with a rotating cavity matched with the support rod, and the bottom of the support rod is arranged in close contact with the negative pressure mechanism. The negative pressure mechanism is annular, the two ends of the negative pressure mechanism are elastically attached to the inside of the air inlet cavity through first elastic members, and the negative pressure mechanism comprises multiple groups of conductive plates. The conductive plates are filled with second elastic members, the conductive plates are provided with limiting inclined grooves matched with the support rods, the bottom of the limiting inclined grooves is provided with a negative pressure groove, the bottom of the support rod is provided with a tangent surface matched with the negative pressure groove, and the bottom of the support rod is penetrated and matched with the negative pressure groove, the outer end surface of the conductive plate is fixedly connected with a limiting rod, the limiting rod is slidingly connected inside the spray pipe, and the negative pressure groove is inclined along the air outlet direction of the air inlet cavity. The upper surface of the negative pressure groove is attached with a sealing plate, one side of the inner wall of the limiting inclined groove is provided with a sliding groove, the sealing plate is elastically embedded inside the sliding groove, and the end of the sealing plate away from the sliding groove is fixedly connected with an abutting block.

2. The adjustable intelligent paint spraying device for vehicle repair of claim 1, wherein: The outer end surface of the spray pipe is provided with a paint pot for fixing the collection layer, the end of the collection layer away from the spray pipe is provided with a first magnetic sheet matched with the support rod, and the spray pipe is provided with a clamping groove matched with the paint pot.

3. The adjustable intelligent paint spraying device for vehicle repair of claim 2, wherein: The outer end surface of the support rod is provided with a limiting protrusion, and the inner wall of the rotating cavity is provided with a limiting groove matched with the limiting protrusion.

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