Air compressor cylinder body sealing performance detection device

Abstract

The utility model provides an air compressor cylinder body sealing performance detection device, which relates to the technical field of sealing detection and comprises a workbench, a positioning assembly used for fixing the position of an air compressor cylinder body is installed on the upper surface of the workbench, an expansion frame is arranged on one side of the upper surface of the workbench, and a sliding rail is arranged on one side of the expansion frame. A detection assembly used for detecting the sealing performance of the air compressor cylinder body is arranged on the sliding rail and the upper surface of the expansion frame together, and one side of the detection assembly is connected with a positioning assembly. In order to quickly switch outer ring channels in a plurality of cylinder bodies, the position of the secondary channel is switched by rotating the turntable, so that the secondary channel can be adapted to the outer ring channels of the plurality of cylinder bodies, quick connection detection is realized, and compared with the existing equipment, the device can be adapted to a plurality of channels for independent detection, so that the detection efficiency is improved. And when the detection position is replaced, rapid adjustment can be achieved, compared with existing equipment, the cylinder does not need to be adjusted, and the working intensity of workers is reduced.

Description

Technical Field

[0001] This utility model relates to the field of sealing testing technology, and more specifically, to a device for testing the sealing performance of an air compressor cylinder. Background Technology

[0002] An air compressor is a device used to compress gas. Air compressors are similar in construction to water pumps. Most air compressors are reciprocating piston, rotary vane, or rotary screw types. During the air compressor production process, to ensure product quality, the air compressor cylinder needs performance testing. Poor sealing performance of the air compressor cylinder can lead to air leakage during processing, resulting in decreased operating efficiency. Existing sealing testing equipment typically only tests one cavity at a time. Since existing air compressor cylinders can be single-channel or multi-channel, frequent changes in the position of the test object are necessary. The weight of the object increases the workload for operators. Furthermore, existing testing devices are not suitable for testing air compressor cylinders of varying lengths. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides an air compressor cylinder sealing performance testing device, which solves the problem that existing sealing testing devices cannot be adapted to air compressor cylinders and require frequent changes of the object position when dealing with air compressor cylinders with multiple channels.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An air compressor cylinder sealing performance testing device includes a workbench. A positioning component for fixing the position of the air compressor cylinder is installed on the upper surface of the workbench. An extension frame is provided on one side of the upper surface of the workbench, and a slide rail is provided on one side of the extension frame. A testing component for testing the sealing performance of the air compressor cylinder is jointly provided on the upper surface of the slide rail and the extension frame. One side of the testing component is connected to the positioning component.

[0006] Preferably, the detection component includes a slider seat and a pre-storage tank. The slider seat is slidably mounted above the slide rail, and the pre-storage tank is fixedly mounted on the upper surface of the extension frame. A detection box is mounted on the upper surface of the slider seat. One end of the detection box is connected to the positioning component, and the other end of the detection box is connected to the pre-storage tank.

[0007] Preferably, the detection box has a ventilation channel inside, and a solenoid valve is fixedly installed at both ends of the ventilation channel. One of the solenoid valves is fixedly connected to the pre-storage tank by a connecting hose.

[0008] Preferably, the ventilation duct has a tilting groove in the middle, and a sealing block is installed inside the tilting groove by rotating a shaft. The sealing block has mating grooves on both sides near the ventilation duct.

[0009] Preferably, the upper end of the flipping groove is provided with an expansion groove, an observation window is fixedly installed at the upper end of the expansion groove, a limit measuring plate is provided in the middle of the expansion groove, the upper end of the sealing block is provided with a movable limiting groove, and the limit measuring plate extends into the movable limiting groove.

[0010] Preferably, the positioning component includes a first slide groove, a first motor is fixedly installed on one side of the first slide groove, a first positive and negative lead screw is fixedly installed at the output end of the first motor, a detection docking plate and a sealing clamping plate are slidably installed on both sides inside the first slide groove, a sealing pad is provided on the surface of the sealing clamping plate, and the bottom of the detection docking plate and the sealing clamping plate are threaded with the first positive and negative lead screw.

[0011] Preferably, the detection docking plate has a rotating groove inside, and a turntable is rotatably installed inside the rotating groove. A main channel is opened through the center of the turntable, and a secondary channel is opened through one side of the turntable. The surfaces of the main channel and the secondary channel away from the sealing clamping plate are connected to connecting pipes. A sealing ring is provided on the other side of the main channel and the secondary channel. A connecting box is installed at the ends of the two connecting pipes. A deflecting pipe is fixedly connected between the connecting box and another solenoid valve.

[0012] Preferably, the inner wall of the connecting box has a limiting groove, a sealing baffle is provided between the limiting grooves, and limiting blocks for sliding connection with the limiting groove are provided on both sides of the sealing baffle. A bolt is rotatably installed in the middle of the connecting box, and a knob is installed through the upper end of the bolt through the connecting box. The bolt passes through the middle of the sealing baffle and is threaded.

[0013] Preferably, a second slide groove is provided in the middle of the worktable, a second motor is fixedly installed on one side of the second slide groove, a second positive and negative lead screw is fixedly installed at the output end of the second motor, and positioning clamps are slidably installed on both sides of the second slide groove, and the body of the second positive and negative lead screw is threadedly engaged with the positioning clamp.

[0014] Preferably, an air pump is fixedly installed on one side of the upper surface of the slider seat, and a branch pipe is fixedly installed at the air outlet of the air pump. The ends of the branch pipe are respectively connected to a connecting hose and a steering pipe.

[0015] The upper surface of the extension frame is provided with a movable groove, and a movable block is movably installed inside the movable groove. An auxiliary roller for supporting the connecting hose is provided at the upper end of the movable block, and a support spring is fixedly installed between the movable block and the inner wall of the movable groove.

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

[0017] 1. To enable rapid switching of outer ring channels in multiple cylinders, the connection between the main channel, secondary channel, and multiple channels in the cylinder is disconnected by activating the first positive and negative lead screw. Then, the turntable is rotated, causing the position of the secondary channel to switch, allowing it to adapt to multiple outer ring channels in the cylinder. This enables rapid connection and testing. Compared to existing equipment that can only perform overall testing, this application allows for individual testing of multiple channels, thus avoiding the problem of air leakage between channels that cannot be detected due to the overall testing capability of existing equipment. Furthermore, this application allows for rapid adjustment when changing the testing position, eliminating the need for cylinder adjustments compared to existing equipment and reducing the workload of personnel.

[0018] 2. When fixing the cylinder body, adjustments can be made according to the current cylinder body channel. If it is necessary to measure the outer ring channel in the cylinder body separately, first rotate the knob to drive the bolt to rotate. Under the limiting cooperation of the limiting groove and the limiting block, the bolt and the sealing baffle threadedly engage, and the upper and lower positions of the sealing baffle change, thereby realizing the switching of the through holes of the two connecting pipes. Since the main channel, secondary channel and multiple channels in the cylinder body are interconnected when fixing the cylinder body, the cylinder body channel can be connected by controlling the connecting pipe, thereby reducing the need for manual operation.

[0019] 3. The auxiliary roller can continuously support the connecting hose by pushing the movable block with the support spring. This ensures that the connecting hose will not loosen while the position of the detection component is adjusted. In conjunction with the positioning component, it can perform stable sealing tests on cylinders of different lengths. To quickly view the test results, the limit measuring plate can restrict the movable limiting groove to prevent the sealing block from moving excessively and causing measurement failure. The position deviation of the movable limiting groove can be observed through the observation window to determine whether the sealing block is balanced and whether there is an air leak in the cylinder channel. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the workbench;

[0022] Figure 3 This is a top view of the workbench structure.

[0023] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional cross-section at point AA;

[0024] Figure 5 yes Figure 3 Schematic diagram of the three-dimensional cross-section at point BB;

[0025] Figure 6 This is a three-dimensional exploded view of the test docking plate;

[0026] Figure 7 This is an exploded top view of the test docking plate.

[0027] Figure 8 yes Figure 7 Schematic diagram of the three-dimensional structure of the cross-section at the CC point;

[0028] Figure 9 yes Figure 7 Schematic diagram of the three-dimensional cross-section at point DD;

[0029] Figure 10 This is a 3D structural diagram of the detection component;

[0030] Figure 11 This is a three-dimensional structural diagram of the detection box;

[0031] Figure 12 This is a top view of the detection box.

[0032] Figure 13 yes Figure 12 Schematic diagram of the three-dimensional structure of the cross section at the EE point.

[0033] In the diagram: 1. Workbench; 2. Positioning assembly; 201. First slide rail; 202. Detection docking plate; 2021. Turntable; 2022. Rotation groove; 2023. Sealing ring; 2024. Main channel; 2025. Secondary channel; 2026. Connecting box; 20261. Limiting groove; 20262. Bolt; 20263. Limiting block; 20264. Sealing baffle; 20265. Knob; 2027. Connecting pipe; 2028. Steering pipe; 203. Sealing clamping plate; 2031. Sealing gasket; 204. First positive and negative lead screw; 205. First motor; 206. Second motor; 207. Positioning clamp; 208. Second slide groove; 209. Second positive and negative lead screw; 3. Detection assembly; 301. Slider seat; 302. Detection box; 3021. Expansion groove; 3022. Observation window; 3023. Limit measuring plate; 3024. Tilting groove; 3025. Sealing block; 3026. Mating groove; 3027. Ventilation duct; 3028. Movement restriction groove; 303. Air pump; 304. Branch pipe; 305. Solenoid valve; 306. Connecting hose; 307. Pre-storage tank; 4. Expansion frame; 5. Auxiliary roller; 6. Slide rail; 7. Movable groove; 8. Movable block; 9. Support spring. Detailed Implementation

[0034] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0035] like Figures 1 to 13 As shown, an air compressor cylinder sealing performance testing device includes a workbench 1. A positioning component 2 for fixing the position of the air compressor cylinder is installed on the upper surface of the workbench 1. An extension frame 4 is provided on one side of the upper surface of the workbench 1. A slide rail 6 is provided on one side of the extension frame 4. A testing component 3 for testing the sealing performance of the air compressor cylinder is provided on the upper surface of the slide rail 6 and the extension frame 4. One side of the testing component 3 is connected to the positioning component 2.

[0036] The detection component 3 includes a slider seat 301 and a pre-storage tank 307. The slider seat 301 is slidably mounted above the slide rail 6, and the pre-storage tank 307 is fixedly mounted on the upper surface of the extension frame 4. A detection box 302 is mounted on the upper surface of the slider seat 301. One end of the detection box 302 is connected to the positioning component 2, and the other end of the detection box 302 is connected to the pre-storage tank 307.

[0037] It should be noted that the test box 302 has a ventilation duct 3027 inside, and a solenoid valve 305 is fixedly installed at both ends of the ventilation duct 3027. One of the solenoid valves 305 is fixedly connected to the pre-storage tank 307 by a connecting hose 306. By setting up the solenoid valve 305, the air pressure inside the pre-storage tank 307 can be controlled independently, and the standard can be customized as needed.

[0038] In its specific design, the ventilation duct 3027 has a tilting groove 3024 in the middle. A sealing block 3025 is rotatably mounted inside the tilting groove 3024 via a rotating shaft. The sealing block 3025 has mating grooves 3026 on both sides near the ventilation duct 3027. By rotating the sealing block 3025, any displacement of the sealing block 3025 can indicate whether the cylinder is leaking, thus facilitating the identification of the inspection results.

[0039] It is understood that in this application, the upper end of the flip groove 3024 is provided with an expansion groove 3021, and an observation window 3022 is fixedly installed at the upper end of the expansion groove 3021. A limit measuring plate 3023 is provided in the middle of the expansion groove 3021, and a movable limiting groove 3028 is provided at the upper end of the sealing block 3025. The limit measuring plate 3023 extends into the movable limiting groove 3028. By utilizing the limiting cooperation between the limit measuring plate 3023 and the movable limiting groove 3028, it is possible to determine whether the sealing block 3025 has shifted when it is observed that the position between the limit measuring plate 3023 and the movable limiting groove 3028 is observed. This also prevents the sealing block 3025 from shifting too much, which could lead to deviations in the detection results.

[0040] The positioning component 2 includes a first slide groove 201. A first motor 205 is fixedly installed on one side of the first slide groove 201, and a first positive and negative lead screw 204 is fixedly installed at the output end of the first motor 205. A detection docking plate 202 and a sealing clamping plate 203 are slidably installed on both sides inside the first slide groove 201, respectively. A sealing pad 2031 is provided on the surface of the sealing clamping plate 203. The bottoms of both the detection docking plate 202 and the sealing clamping plate 203 are threadedly engaged with the first positive and negative lead screw 204. By activating the first motor 205 and limiting its position in the first slide groove 201, the sealing clamping plate 203 can engage with the first positive and negative lead screw 204, thereby clamping the cylinder body with the detection docking plates 202 and the sealing clamping plates 203 on both sides.

[0041] It should be noted that the detection docking plate 202 has a rotating groove 2022 inside, and a turntable 2021 is rotatably installed inside the rotating groove 2022. A main channel 2024 is opened through the center of the turntable 2021, and a secondary channel 2025 is opened through one side of the turntable 2021. The surfaces of the main channel 2024 and the secondary channel 2025 on the side away from the sealing clamping plate 203 are connected to connecting pipes 2027. A sealing ring 2023 is provided on the other side of the main channel 2024 and the secondary channel 2025. A connecting box 2026 is installed at the ends of the two connecting pipes 2027. A diverting pipe 2028 is fixedly connected between the connecting box 2026 and another solenoid valve 305. In order to achieve interconnection of channels, the sealing rings 2023 provided on one side of the main channel 2024 and the secondary channel 2025 are fitted with the channels inside the cylinder, so as to achieve quick docking of the cylinder with this application. This allows the steering pipe 2028 to transfer gas into the cylinder when receiving gas, thereby realizing the sealing test of the cylinder.

[0042] A limiting groove 20261 is formed on the inner wall of the connecting box 2026. A sealing baffle 20264 is provided between the limiting grooves 20261. Limiting blocks 20263 are provided on both sides of the sealing baffle 20264 for sliding connection with the limiting grooves 20261. A bolt 20262 is rotatably installed in the middle of the connecting box 2026. A knob 20265 is installed through the upper end of the bolt 20262 and sealed through the middle of the sealing baffle 20264. By rotating the bolt 20262, the sealing baffle 20264 can be moved up and down, thereby quickly switching the flow between the main channel 2024 and the secondary channel 2025, thus reducing manual operation.

[0043] In the specific setup, a second slide groove 208 is provided in the middle of the worktable 1. A second motor 206 is fixedly installed on one side of the second slide groove 208, and a second positive and negative lead screw 209 is fixedly installed at the output end of the second motor 206. Positioning clamps 207 are slidably installed on both sides of the second slide groove 208, and the body of the second positive and negative lead screw 209 is threadedly engaged with the positioning clamp 207. By starting the second motor 206, under the limit of the second slide groove 208, the second positive and negative lead screw 209 can drive the positioning clamp 207 to move and clamp and position the cylinder on both sides, so that the position of the cylinder is centered, thereby making the channel more accurate during docking.

[0044] Among them, an air pump 303 is fixedly installed on one side of the upper surface of the slider seat 301, and a branch pipe 304 is fixedly installed at the air outlet of the air pump 303. The end of the branch pipe 304 is connected to the connecting hose 306 and the turning pipe 2028 respectively. By starting the air pump 303, gas transmission operation can be performed on the connecting hose 306 and the turning pipe 2028, thereby providing gas for testing the sealing performance.

[0045] The upper surface of the extension frame 4 has a movable groove 7, and a movable block 8 is movably installed inside the movable groove 7. An auxiliary roller 5 for supporting the connecting hose 306 is provided at the upper end of the movable block 8. A support spring 9 is fixedly installed between the movable block 8 and the inner wall of the movable groove 7. By pushing the movable block 8 with the support spring 9, the auxiliary roller 5 can continuously support the connecting hose 306, so that the connecting hose 306 will not loosen when the position of the detection component 3 is adjusted. Thus, in conjunction with the positioning component 2, stable sealing detection can be performed on cylinders of different lengths.

[0046] The working principle of this air compressor cylinder sealing performance testing device:

[0047] In use, first place the air compressor cylinder to be tested on the upper surface of the workbench 1 and in the middle of the positioning assembly 2. Then start the second motor 206 and the first motor 205 to drive the first positive and negative lead screw 204 and the second positive and negative lead screw 209 to rotate. Under the limit of the first slide groove 201 and the second slide groove 208, the first positive and negative lead screw 204 is fixed at both ends of the cylinder by threaded engagement with the detection docking plate 202 and the sealing clamping plate 203. The cylinder placed on the upper surface of the workbench 1 is centered and positioned by the second positive and negative lead screw 209 and the positioning clamps 207 on both sides. Then the cylinder is fixed.

[0048] When fixing the cylinder body, adjustments can be made according to the current cylinder body channel. If it is necessary to measure the outer ring channel in the cylinder body separately, first rotate the knob 20265 to drive the bolt 20262 to rotate. Under the limiting cooperation of the limiting groove 20261 and the limiting block 20263, the bolt 20262 is threadedly engaged with the sealing baffle 20264, and the upper and lower positions of the sealing baffle 20264 change, thereby realizing the switching of opening of the through holes of the two connecting pipes 2027. Since the main channel 2024 and the secondary channel 2025 are interconnected with multiple channels in the cylinder body when fixing the cylinder body, the cylinder body channel can be connected by controlling the connecting pipe 2027.

[0049] To enable rapid switching of outer ring channels in multiple cylinders, the first positive and negative lead screw 204 is activated to disconnect the main channel 2024 and secondary channel 2025 from multiple channels in the cylinder. Then, the turntable 2021 is rotated, causing the position of the secondary channel 2025 to switch, allowing it to adapt to multiple outer ring channels in the cylinders. This enables rapid connection and testing. Compared to existing equipment that can only perform overall testing, this application allows for individual testing of multiple channels, thus avoiding the problem of air leakage between channels that cannot be detected due to the existing equipment's limitation to overall testing. Furthermore, this application allows for rapid adjustment when changing the testing position, eliminating the need for cylinder adjustments compared to existing equipment and reducing the workload of personnel.

[0050] After the fixing is completed, in order to test the sealing performance of the cylinder, the air pump 303 is started. Under the control of two solenoid valves 305, the gas is first transmitted to the connecting hose 306, and the required standard gas is stored in the pre-storage tank 307 as needed, thereby determining the test standard. Then, the air pump 303 is started again to transmit the gas to the diverting pipe 2028, and it is connected to the main channel 2024, the secondary channel 2025 and the cylinder channel through the connecting box 2026. During the transmission, the solenoid valve 305 is opened, so that the gas on both sides pushes the sealing block 3025 to rotate inside the flipping groove 3024 under the guidance of the mating groove 3026. If the cylinder channel leaks, the standard air pressure in the pre-storage tank 307 will push the sealing block 3025 to one side of the cylinder. When there is no leakage, the sealing block 3025 will remain balanced because the air pressure in the pre-storage tank 307 and the cylinder are the same.

[0051] In order to quickly view the test results, the limit measuring plate 3023 can restrict the movable limit groove 3028 to prevent the sealing block 3025 from moving excessively and causing measurement failure. The position deviation of the movable limit groove 3028 can be observed through the observation window 3022, so as to know whether the sealing block 3025 is balanced, and thus determine whether the cylinder channel is leaking.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A device for testing the sealing performance of an air compressor cylinder, comprising a workbench (1), characterized in that: The upper surface of the workbench (1) is equipped with a positioning component (2) for fixing the position of the air compressor cylinder. An extension frame (4) is provided on one side of the upper surface of the workbench (1). A slide rail (6) is provided on one side of the extension frame (4). The upper surfaces of the slide rail (6) and the extension frame (4) are jointly provided with a detection component (3) for detecting the sealing performance of the air compressor cylinder. One side of the detection component (3) is connected to the positioning component (2).

2. The air compressor cylinder sealing performance testing device according to claim 1, characterized in that: The detection component (3) includes a slider seat (301) and a pre-storage tank (307). The slider seat (301) is slidably mounted above the slide rail (6). The pre-storage tank (307) is fixedly mounted on the upper surface of the extension frame (4). A detection box (302) is mounted on the upper surface of the slider seat (301). One end of the detection box (302) is connected to the positioning component (2), and the other end of the detection box (302) is connected to the pre-storage tank (307).

3. The air compressor cylinder sealing performance testing device according to claim 2, characterized in that: The detection box (302) has a ventilation channel (3027) inside. Solenoid valves (305) are fixedly installed at both ends of the ventilation channel (3027). A connecting hose (306) is fixedly connected between one of the solenoid valves (305) and the pre-storage tank (307).

4. The air compressor cylinder sealing performance testing device according to claim 3, characterized in that: The ventilation duct (3027) has a tilting groove (3024) in the middle. A sealing block (3025) is installed inside the tilting groove (3024) by rotating a shaft. The sealing block (3025) has mating grooves (3026) on both sides near the ventilation duct (3027).

5. The air compressor cylinder sealing performance testing device according to claim 4, characterized in that: An expansion slot (3021) is provided at the upper end of the flipping slot (3024), and an observation window (3022) is fixedly installed at the upper end of the expansion slot (3021). A limit measuring plate (3023) is provided in the middle of the expansion slot (3021), and an active restriction slot (3028) is provided at the upper end of the sealing block (3025). The limit measuring plate (3023) extends into the active restriction slot (3028).

6. The air compressor cylinder sealing performance testing device according to claim 3, characterized in that: The positioning component (2) includes a first slide groove (201), a first motor (205) is fixedly installed on one side of the first slide groove (201), a first positive and negative lead screw (204) is fixedly installed at the output end of the first motor (205), a detection docking plate (202) and a sealing clamping plate (203) are slidably installed on both sides inside the first slide groove (201), a sealing pad (2031) is provided on the surface of the sealing clamping plate (203), and the bottom of the detection docking plate (202) and the sealing clamping plate (203) are threadedly engaged with the first positive and negative lead screw (204).

7. The air compressor cylinder sealing performance testing device according to claim 6, characterized in that: The detection docking plate (202) has a rotating groove (2022) inside, and a turntable (2021) is rotatably installed inside the rotating groove (2022). A main channel (2024) is opened through the center of the turntable (2021), and a secondary channel (2025) is opened through one side of the turntable (2021). The surfaces of the main channel (2024) and the secondary channel (2025) away from the sealing clamping plate (203) are connected to connecting pipes (2027). A sealing ring (2023) is provided on the other side of the main channel (2024) and the secondary channel (2025). A connecting box (2026) is installed at the ends of the two connecting pipes (2027). A steering pipe (2028) is fixedly connected between the connecting box (2026) and another solenoid valve (305).

8. The air compressor cylinder sealing performance testing device according to claim 7, characterized in that: The inner wall of the connecting box (2026) is provided with a limiting groove (20261), and a sealing baffle (20264) is provided between the limiting grooves (20261). Limiting blocks (20263) for sliding connection with the limiting grooves (20261) are provided on both sides of the sealing baffle (20264). A bolt (20262) is rotatably installed in the middle of the connecting box (2026). A knob (20265) is installed in the upper end of the bolt (20262) through the connecting box (2026). The bolt (20262) passes through the middle of the sealing baffle (20264) and is threaded.

9. The air compressor cylinder sealing performance testing device according to claim 6, characterized in that: The workbench (1) has a second slide groove (208) in the middle. A second motor (206) is fixedly installed on one side of the second slide groove (208). A second positive and negative lead screw (209) is fixedly installed at the output end of the second motor (206). Positioning clamps (207) are slidably installed on both sides of the second slide groove (208). The rod body of the second positive and negative lead screw (209) is threadedly engaged with the positioning clamp (207).

10. The air compressor cylinder sealing performance testing device according to claim 7, characterized in that: An air pump (303) is fixedly installed on one side of the upper surface of the slider seat (301). A branch pipe (304) is fixedly installed at the air outlet of the air pump (303). The ends of the branch pipe (304) are respectively connected to the connecting hose (306) and the steering pipe (2028). The upper surface of the extension frame (4) is provided with a movable groove (7), and a movable block (8) is movably installed inside the movable groove (7). An auxiliary roller (5) for supporting the connecting hose (306) is provided at the upper end of the movable block (8), and a support spring (9) is fixedly installed between the movable block (8) and the inner wall of the movable groove (7).

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