Air tightness detection equipment for automobile brake oil pipe

Abstract

The invention discloses air tightness detection equipment for an automobile brake oil pipe, and relates to the technical field of brake oil pipe air tightness detection. The air tightness detection equipment for the automobile brake oil pipe comprises an air tightness detector body and a brake oil pipe body, one end of the brake oil pipe body is fixedly provided with an annular joint, the other end of the brake oil pipe body is fixedly provided with a flaring joint, and one side of the air tightness detector body is provided with a display control screen. According to the air tightness detection equipment for the automobile brake oil pipe, the air pump arranged in the air tightness detector body injects air into the sliding groove through the air source pipe, on one hand, the effect of automatic butt joint is achieved, the effect of reducing the manufacturing cost and the use cost of the air tightness detection equipment is achieved, and on the other hand, the effect of middle limiting is achieved; on the other hand, the automatic supporting effect is achieved, and the effect of improving the accuracy of the detection result of the airtightness detection equipment is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brake pipe gas tightness detection, in particular to a kind of automobile brake pipe gas tightness detection equipment. BACKGROUND

[0002] Automobile brake system is the core component to ensure the safety of vehicle driving, and its performance stability is directly related to the safety of the driver and passenger. And brake pipe, as the key channel of brake system to transfer brake fluid, its gas tightness is an important indicator of whether the brake system can work normally. If there is a small leak in the brake pipe, it will cause the brake fluid pressure to drop, resulting in brake delay, brake distance lengthening and even brake failure, etc. Therefore, using gas tightness detection equipment to strictly detect the gas tightness of automobile brake pipe is an indispensable key link in the process of automobile production.

[0003] When the gas tightness detection equipment detects the brake pipe by using direct pressure detection method, it usually operates in three steps: first, inflate the closed brake pipe to the set pressure, then stop the air supply; Next, enter the pressure maintaining stage and stand for a certain time; Finally, if the measured pipe has air leakage, the internal pressure will decrease, and the instrument will monitor the pressure change through the detection probe of the pressure sensor. When the pressure drop value exceeds the preset threshold, it is judged as unqualified. However, in this detection process, there are obvious operation limitations: the staff needs to manually operate, or additional driving source needs to be set to connect the two ends of the brake pipe with the joint of the detection equipment. This way cannot realize the automatic connection of the joint by using the air source itself, not only increases the complexity of the operation, but also leads to the high overall cost and subsequent use cost of the gas tightness detection equipment, and thus the cost and use cost of the gas tightness detection equipment are high.

[0004] Therefore, it is necessary to invent a kind of automobile brake pipe gas tightness detection equipment to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a kind of automobile brake pipe gas tightness detection equipment to solve the problems raised in the above background.

[0006] In order to solve the above technical problems, the present application provides the following technical scheme: a kind of air tightness detection equipment of automobile brake oil pipe, including air tightness detector body and brake oil pipe body, the brake oil pipe body one end is fixed with annular joint, the brake oil pipe body other end is fixed with flared joint, the air tightness detector body one side is provided with display control screen, the air tightness detector body both sides are all equipped with several air vents, the air tightness detector body rear side is provided with connecting power plug, the air tightness detector body upper end is fixed with fixed frame, the fixed frame one side is fixed with gas source pipe, the fixed frame other side is fixed with connecting line, the connecting line one end is fixed with sealing detection probe, the fixed frame side close to sealing detection probe is fixed with first rubber ring, the fixed frame middle part is equipped with through groove; The fixed frame side close to gas source pipe is equipped with sliding slot, the sliding slot upper side is equipped with gas injection hole, the fixed frame side close to gas injection hole is fixed with second rubber ring, the sliding slot inner wall is provided with connecting structure, and connecting structure is provided with placing rack;Connecting structure can move with the depth direction of sliding slot with placing rack, so as to use the gas source of built-in air pump of air tightness detector body as the only driving force, without additional driving device, can drive the brake oil pipe body of being placed to move, to automatically complete interface docking, reduce equipment cost and use cost.

[0007] Preferably, the connecting structure includes a sliding block, a third rubber ring is fixed on the upper side of the sliding block, a fixed block is fixed on the upper side of the sliding block, a connecting block is fixed on the upper end of the fixed block, and placing racks are fixed on both ends of the connecting block.

[0008] Preferably, the outer surface of the sliding block is slidingly connected to the inner wall of the sliding slot, the cross section of the sliding slot is T-shaped, one end of the gas source pipe is connected to the lower side of the sliding slot, the other end of the gas source pipe is connected to the built-in air pump of the air tightness detector body, the gas injection hole penetrates the side of the fixed frame, the second rubber ring is arranged below the gas injection hole, one end of the connecting line is connected to the sealing detection probe, the sealing detection probe penetrates the other side of the fixed frame, the other end of the connecting line is connected to the air tightness detector body, and the first rubber ring is arranged below the sealing detection probe.

[0009] Preferably, the lower end of the third rubber ring is fixed to the upper side of the slider, the lower end of the fixed block is fixed to the middle of the upper side of the slider, the fixed block is arranged in the third rubber ring, the fixed block passes through the upper side of the slide groove, the upper end of the fixed block is fixed to one side of the connecting block, the two ends of the connecting block are fixed to the middle of the two ends of the placement frame, the outer surface of the connecting block is slidably connected to the inner wall of the through groove, the outer surface of the placement frame is slidably connected to the inner wall of the fixing frame, the vertical section of the fixing frame is U-shaped, the outer surfaces of the annular joint and the flared joint are in contact with the upper surfaces on both sides of the placement frame, and the outer surface of the brake oil pipe body is in contact with the inner wall of the groove.

[0010] Preferably, two sliding racks are slidably connected to the outer surface of one side of the placement rack, rubber pads are fixed on the adjacent sides of the two sliding racks, the upper ends of the two sliding racks are rotatably connected to connecting racks, and the other ends of the two connecting racks are rotatably connected to connecting seats. The connecting rack drives the two sliding racks to slide along the surface of the placement rack and approach each other through angle changes, so as to improve the docking accuracy of the brake oil pipe annular joint and the detection interface, thereby improving the operating efficiency of the equipment driven by the air source.

[0011] Preferably, the inner walls of the two sliding frames are slidably connected to the outer surface of one side of the placement frame, the two sliding frames are arranged opposite to each other, the middle parts of the two sliding frames are hollowed out, and the sides of the two rubber pads that are away from each other are respectively fixed to the sides of the two sliding frames that are close to each other.

[0012] Preferably, the proximal ends of the two connecting frames are rotatably connected to the upper ends of the two sliding frames, and the separated ends of the two connecting frames are rotatably connected to the lower ends of the two connecting seats. The vertical sections of the two sliding frames are T-shaped, and the upper ends of the two connecting seats are fixed to the fixed frames near the two sides of the air injection holes.

[0013] Preferably, a stabilizing groove is opened in the middle of the placement rack, and a stabilizing block is slidably connected to the inner wall of the stabilizing groove, a support rack is fixed to one end of the stabilizing block, and the other end of the stabilizing block is rotatably connected to a connecting rack, and the upper end of the connecting rack is rotatably connected to a connecting seat. When the placement rack is displaced under the drive of the air source, the connecting rack pushes the stabilizing block to slide along the stabilizing groove, so that the support rack automatically extends and supports the brake oil pipe body, so as to avoid detection errors caused by bending of the oil pipe due to its own weight.

[0014] Preferably, the stabilizing groove runs through the middle of the placement frame, the outer surface of the stabilizing block is slidably connected to the inner wall of the stabilizing groove, the lower end of the stabilizing block is fixed to the middle of the support frame, and the outer surface of the support frame contacts the outer surface of the brake oil pipe body.

[0015] Preferably, the upper end of the stabilizing block is rotatably connected to the lower end of the connecting frame, the upper end of the connecting frame is rotatably connected to the lower end of the connecting seat, the upper end of the connecting seat is fixed to the rear side of the middle part of the fixing frame, the vertical section of the connecting seat is U-shaped, and the vertical section of the stabilizing block is L-shaped.

[0016] Compared with the prior art, the present application has the following advantages: (1) The gas pump built in the gas tightness detector body injects gas into the chute through the gas source pipe, so that the sliding block, the third rubber ring, the fixed block, the connecting block, the placing rack, and the groove cooperate with each other to realize automatic docking effect, and the joint docking is completed by the driving force of the gas source itself, without manual operation or additional driving source, thereby reducing the cost and use cost of the gas tightness detection equipment; (2) The gas pump built in the gas tightness detector body injects gas into the chute through the gas source pipe, so that the placing rack, the sliding rack, the rubber pad, the connecting rack, and the connecting seat cooperate with each other to realize the effect of middle limiting, without manual adjustment operation by the staff, which brings convenience to the use of the staff, thereby improving the use convenience of the gas tightness detection equipment; (3) The gas pump built in the gas tightness detector body injects gas into the chute through the gas source pipe, so that the placing rack, the stabilizing groove, the stabilizing block, the supporting rack, the connecting rack, and the connecting seat cooperate with each other to realize the effect of automatic support, thereby avoiding the volume change caused by the bending of the pipe body to affect the detection result, and improving the accuracy of the detection result of the sealing detection equipment. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the overall structure diagram of the present application; Figure 2 is the overall rear view of the present application; Figure 3 is the partial sectional view of the present application; Figure 4 is the front view of the fixed rack of the present application; Figure 5 is the side view of the fixed rack of the present application; Figure 6 is the sectional view of the placing rack of the present application; Figure 7 is the structure of the present application Figure 6 is the enlarged view of A part of the present application; Figure 8 is the partial structure schematic view of the present application; Figure 9 is the fixed rack structure schematic view of the present application; Figure 10 is the brake oil pipe body structure schematic view of the present application.

[0018] In the figure: 1, air tightness detector body; 2, brake oil pipe body; 3, annular joint; 4, flared joint; 5, display control screen; 6, air vent; 7, connecting power plug; 8, fixing frame; 9, air source pipe; 10, connecting line; 11, sealing detection probe; 12, first rubber ring; 13, sliding groove; 14, air injection hole; 15, second rubber ring; 16, sliding block; 17, third rubber ring; 18, fixed block; 19, connecting block; 20, placing frame; 21, sliding frame; 22, rubber pad; 23, connecting frame; 24, connecting seat; 25, stabilizing groove; 26, stabilizing block; 27, support frame; 28, connecting frame; 29, connecting seat; 30, recess; 31, through groove. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0020] Embodiment one: the embodiment provides an air tightness detection equipment for automobile brake oil pipe; Please refer to Figures 1-10As shown, including airtightness detector body 1 and brake oil pipe body 2, one end of brake oil pipe body 2 is fixed with annular joint 3, the other end of brake oil pipe body 2 is fixed with flared joint 4, one side of airtightness detector body 1 is provided with display control screen 5, airtightness detector body 1 both sides are provided with a plurality of air vents 6, air vent 6 makes the air pump built-in airtightness detector body 1 can inhale air when working, the rear side of airtightness detector body 1 is provided with connecting power plug 7, connecting power plug 7 is connected to power supply, the role of power supply to airtightness detector body 1, the upper end of airtightness detector body 1 is fixed with fixed frame 8, one side of fixed frame 8 is fixed with air source pipe 9, the other side of fixed frame 8 is fixed with connecting line 10, one end of connecting line 10 is fixed with sealing detection probe 11, one side of fixed frame 8 close to sealing detection probe 11 is fixed with first rubber ring 12, through slot 31 is opened in the middle of fixed frame 8, airtightness detector body 1 is HS-P30 type airtightness detector of Herus technology, its built-in air pump can not only provide stable air pressure, but also is equipped with high-precision pressure sensor, the detection accuracy can reach ±0.1%FS, ensure that in the detection of small leakage can also accurately capture data, the air pump adopts oil-free lubrication design, the noise is as low as fifty-five decibels when running, not only avoids the pollution of oil stain to the detection environment, but also can keep quiet working atmosphere in laboratory, workshop and other scenes, in the functional design, HS-P30 supports multiple detection modes, including direct pressure type, differential pressure type, volumetric type, etc., can be flexibly switched according to different detection needs, the instrument is equipped with seven-inch touch display control screen 5, the operation interface is simple and intuitive, the staff can directly call corresponding parameters through the preset detection program, reduce repeated setting time, greatly improve the detection efficiency; The fixed frame 8 is provided with a sliding groove 13 on the side close to the gas source pipe 9, and a gas injection hole 14 is provided on the upper side of the sliding groove 13. A pressure valve is arranged in the gas injection hole 14 and is electrically connected to the gas tightness detector body 1 through wires. The pressure valve has flexible parameter adjustment function to meet the pressure starting threshold requirement during gas delivery. In terms of overload protection, the pressure valve adopts double protection mechanism. When the system pressure exceeds one and a half times of the set opening pressure, the mechanical overload protection device will be triggered instantly to cut off the medium passage through forced displacement of the valve core, avoiding impact on the pipeline, pump body and other equipment caused by high pressure. The second rubber ring 15 is fixed on the side of the fixed frame 8 close to the gas injection hole 14. A connecting structure is arranged on the inner wall of the sliding groove 13, which includes a sliding block 16. The third rubber ring 17 is fixed on the upper side of the sliding block 16. The fixed block 18 is fixed on the upper side of the sliding block 16. The connecting block 19 is fixed on the upper end of the fixed block 18. The placing rack 20 is fixed on both ends of the connecting block 19. The recess 30 is provided on one side of the placing rack 20. The movement of the sliding block 16 is only driven by the gas source pressure in the sliding groove 13. The third rubber ring 17 seals the opening of the fixed block 18 penetrating through the fixed frame 8 to avoid gas leakage. The gas pump built in the gas tightness detector body 1 injects gas into the sliding groove 13 through the gas source pipe 9, so that the gas generates pressure on the sliding block 16 under the closed sliding groove 13, and the sliding block 16 moves upward. The core principle of this process is based on Pascal's law in fluid mechanics, i.e. a closed liquid or gas can transmit the same external pressure to all directions. When the gas pump built in the gas tightness detector body 1 injects gas into the sliding groove 13 through the gas source pipe 9, the sliding groove 13 as a relatively closed space will gradually increase the internal pressure due to the increase of gas volume. Since the sliding block 16 and the inner wall of the sliding groove 13 are precisely matched, the injected gas cannot leak from the gap, but only forms uniform pressure on the bottom of the sliding block 16. According to the pressure formula F=P×S, where F is the acting force, P is the gas pressure, and S is the effective area of the bottom of the sliding block 16 contacting with the gas, when the pressure P in the sliding groove 13 reaches the preset value due to the continuous gas supply of the gas pump, the upward force F acting on the bottom of the sliding block 16 will overcome the gravity of the sliding block 16, the friction between the sliding block 16 and the sliding groove 13, and the possible load resistance to push the sliding block 16 to move smoothly upward along the sliding groove 13.In addition, in the pressure maintaining stage, the gas in the system is in an isochoric change state, that is, the volumes of the gas source pipe 9, the chute 13 and the brake oil pipe body 2 are fixed, and according to the Charles Law, if the temperature is stable, the internal pressure will remain constant. The instrument monitors the change of the system pressure in real time through the built-in high-precision pressure sensor. Once there is air leakage in the brake oil pipe, the gas overflow from the leakage point will cause the internal pressure P of the system to drop, and the upward force F acting on the bottom of the sliding block 16 will decrease accordingly, the balance state is broken, and the sliding block 16 will move downward to a certain extent under the joint action of gravity and friction. The change of the position of the sliding block 16 will be captured by the displacement sensor of the instrument and converted into intuitive detection data. The workers can quickly determine whether the sealing performance of the brake oil pipe meets the standard through the pressure curve fluctuation on the display screen or the displacement value of the sliding block 16. It is worth noting that due to the large internal pressure, even if the sliding block 16 moves slightly downward when there is air leakage, the placement rack 20 placed synchronously will also move slightly downward, and the placement rack 20 that moves downward will drive the placement of the annular joint 3 and the flared joint 4 and the corresponding second rubber ring 15 and the first rubber ring 12 to only produce a slight change. The deformation of the rubber ring can continue to maintain the state of being tightly connected.

[0021] In the embodiment, the outer surface of the sliding block 16 is slidingly connected to the inner wall of the chute 13, the cross section of the chute 13 is T-shaped, one end of the gas source pipe 9 is connected to the lower side of the chute 13 in communication, the other end of the gas source pipe 9 is connected to the built-in air pump of the gas tightness detector body 1, the gas injection hole 14 penetrates one side of the fixed frame 8, the second rubber ring 15 is arranged below the gas injection hole 14, one end of the connecting line 10 is connected to the sealing detection probe 11, the sealing detection probe 11 penetrates the other side of the fixed frame 8, the other end of the connecting line 10 is connected to the gas tightness detector body 1, the first rubber ring 12 is arranged below the sealing detection probe 11, the lower end of the third rubber ring 17 is fixed to the upper side of the sliding block 16, the lower end of the fixed block 18 is fixed to the upper middle part of the sliding block 16, the fixed block 18 is arranged in the third rubber ring 17, the fixed block 18 penetrates the upper side of the chute 13, the upper end of the fixed block 18 is fixed to one side of the connecting block 19, the connecting block 19 is fixed to the middle part of the two ends of the placement rack 20, the outer surface of the connecting block 19 is slidingly connected to the inner wall of the through groove 31, the outer surface of the placement rack 20 is slidingly connected to the inner wall of the fixed frame 8, the vertical section of the fixed frame 8 is U-shaped, the outer surfaces of the annular joint 3 and the flared joint 4 are in contact with the upper surfaces of the two sides of the placement rack 20, and the outer surface of the brake oil pipe body 2 is in contact with the inner wall of the groove 30, as shown in Figures 1-10 .

[0022] The specific implementation process is as follows: first, the annular joint 3 and the flared joint 4 fixed at both ends of the brake oil pipe body 2 are respectively placed on both sides of the placing rack 20, wherein the brake oil pipe body 2 connected with the flared joint 4 is placed in the groove 30 opened on one side of the placing rack 20, and the annular joint 3 is placed on the other side. Subsequently, the gas pump built in the air tightness detector body 1 injects gas into the sliding groove 13 through the gas source pipe 9, the gas pushes the sliding block 16 slidingly connected in the sliding groove 13 to move upward, the upward moving sliding block 16 drives the fixed block 18 fixed at the upper end thereof to move upward synchronously, and the connecting block 19 at the upper end of the fixed block 18 moves upward synchronously under the limiting action of the inner wall of the through groove 31 in the middle of the fixed rack 8, thereby driving the placing rack 20 fixed at both ends to move upward as a whole; With the upward movement of the placing rack 20, the annular joint 3 and the flared joint 4 at both ends of the brake oil pipe body 2 placed thereon are lifted synchronously. When the sliding block 16 moves upward to the third rubber ring 17 fixed at the upper end thereof and contacts the upper wall of the sliding groove 13, the sliding block 16 gradually opens the blocked gas injection hole 14, and the gas can enter the gas injection hole 14; at this time, the annular joint 3 and the flared joint 4 at both ends of the brake oil pipe body 2 are in contact with the second rubber ring 15 and the first rubber ring 12 on both sides of the fixed rack 8, respectively, wherein the annular joint 3 corresponds to the second rubber ring 15, and the annular joint 3 is located below the gas injection hole 14, the flared joint 4 corresponds to the first rubber ring 12, and the flared joint 4 is located below the sealing detection probe 11, achieving the effect of automatic butt joint, completing the butt joint of the joints by the driving force of the gas source itself, without manual operation or additional driving source, thereby achieving the effect of reducing the cost of the air tightness detection equipment and the use cost.

[0023] In the process of connecting the annular joint of the brake oil pipe with the air tightness detection equipment, the staff often needs to repeatedly align the position of the annular joint to avoid the problem of gas leakage caused by incomplete butt joint of the annular joint and the injection port of the detection equipment. Therefore, the annular joint needs to be centered and positioned to facilitate the staff to place and operate.

[0024] Please refer to Figures 1-10 The function of the middle limiting is added on the basis of the embodiment one; Please refer to Figures 1-10As shown, the outer surface of one side of the placing frame 20 is slidably connected with two sliding frames 21, the proximal side of each of the two sliding frames 21 is fixedly connected with a rubber pad 22, the upper end of each of the two sliding frames 21 is rotatably connected with a connecting frame 23, the other end of each of the two connecting frames 23 is rotatably connected with a connecting seat 24, the two connecting frames 23 drive the two sliding frames 21 to slide along the surface of the placing frame 20 and approach each other through the change of the angle, so as to improve the docking accuracy of the brake oil pipe annular joint 3 and the detection interface, thereby improving the operation efficiency of the equipment driven by the gas source, the inner wall of each of the two sliding frames 21 is slidably connected with the outer surface of one side of the placing frame 20, the two sliding frames 21 are oppositely arranged, the middle part of each of the two sliding frames 21 is hollow, the side away from each other of the two rubber pads 22 is fixedly connected with the side close to each other of the two sliding frames 21, the proximal end of each of the two connecting frames 23 is rotatably connected with the upper end of the two sliding frames 21, the distal end of each of the two connecting frames 23 is rotatably connected with the lower end of the two connecting seats 24, the vertical cutting surface of each of the two sliding frames 21 is T-shaped, the upper end of each of the two connecting seats 24 is fixedly connected with the fixed frame 8 close to the gas injection hole 14 on both sides, and the specific working process is as follows: Figure 6 、and Figure 8 As shown, during the rising process of the placing frame 20, the distance between the connecting points of the connecting frame 23 and the sliding frame 21 and the connecting seat 24 gradually changes, and the inclination angle increases from the initial state to the working state, and the angle change directly drives the two sliding frames 21 to slide along the outer surface of the placing frame 20 and approach each other, and finally completes the clamping and limiting of the annular joint 3, and not only plays a role.

[0025] The specific implementation process is as follows: the gas pump built in the gas tightness detector body 1 injects gas into the chute 13 through the gas source pipe 9, the gas pushes the sliding block 16 slidably connected in the chute 13 to move upward, the upward moving sliding block 16 drives the fixed block 18 fixedly connected with the upper end to move upward synchronously, and the connecting block 19 at the upper end of the fixed block 18 moves upward under the limiting action of the inner wall of the middle part through groove 31 in the fixed frame 8, thereby driving the placing frame 20 fixedly connected with both ends to rise as a whole; The two sliding frames 21 slidably connected with the outer surface of one side of the rising placing frame 20 approach each other under the limiting of the outer surface of the placing frame 20 and the support of the two connecting seats 24 fixedly connected with the two sides of the fixed frame 8, the two sliding frames 21 drive the two rubber pads 22 fixedly connected with the proximal side to approach each other, the two rubber pads 22 approach each other to push the annular joint 3 placed on the placing frame 20 and located between the two rubber pads 22 to the central region, until the instant when the annular joint 3 is docked with the second rubber ring 15, the two rubber pads 22 clamp the annular joint 3 to achieve the effect of middle limiting, without the need for manual adjustment by the staff, which brings convenience to the use of the staff, and further achieves the effect of improving the use convenience of the gas tightness detection equipment; The core role of the connecting frame 23 is to convert the vertical displacement of the placing frame 20 into the horizontal relative movement of the two sliding frames 21: when the placing frame 20 rises, the connecting frame 23 rotates at the upper end of the sliding frame 21 and the lower end of the connecting seat 24, respectively, the inclination angle increases, and the two sliding frames 21 are driven to move closer to each other along the outer surface of the placing frame 20, and the rubber pad 22 is used to realize the center clamping of the annular connector 3. If the connecting frame 23 is missing, the sliding frame 21 cannot automatically synchronize with the displacement of the placing frame 20, and manual adjustment of the position of the annular connector 3 is required to ensure the accuracy of the connection, but it does not affect the lifting displacement of the placing frame 20 itself.

[0026] In the third embodiment, due to the length of the brake oil pipe, after placing the connectors at both ends, the pipe body part of the brake oil pipe will bend downward due to the lack of support. The internal volume of the bent oil pipe will change due to the deformation, and the difference in volume from the standard state will cause the initial pressure balance value to deviate, interfering with the subsequent leakage judgment. The volume change caused by the bending of the pipe body is not a negligible error in the direct pressure detection method: when the oil pipe is bent, the stretching or extrusion of the pipe wall will change the actual volume of the internal cavity. The core logic of the direct pressure detection method is to monitor the change of pressure after a certain pressure is applied to the measured volume to judge whether there is a leak, and the deviation of the volume reference will directly cause the initial state of the pressure balance to be distorted. Even if the oil pipe is completely leak-free, it may be misjudged as having a leak due to the volume difference, or the real small leak may be covered up. Therefore, the interference caused by the bending of the pipe body must be eliminated by a support structure to ensure that the oil pipe maintains the same shape as the standard state during the detection process, thereby providing a stable volume reference for the direct pressure detection method and fundamentally improving the accuracy of the detection result.

[0027] Please refer to Figures 1-10 As shown in FIG. 1, the automatic support function is added based on the first embodiment; Please refer to Figures 1-10 As shown in FIG. 1, the automatic support function is added based on the first embodiment; As shown in FIG. 1, the automatic support function is added based on the first embodiment;

[0028] The specific implementation process is as follows: the gas pump built in the airtight detector body 1 injects gas into the chute 13 through the gas source pipe 9, and the gas pushes the sliding block 16 connected in the chute 13 to move upward. The fixed block 18 fixed at the upper end of the sliding block 16 also moves upward synchronously; the connecting block 19 at the upper end of the fixed block 18 also rises synchronously under the limiting action of the inner wall of the through groove 31 in the middle of the fixed frame 8, thereby driving the whole lifting of the placing frame 20 fixed at both ends; In the process of lifting the placing frame 20, the stable block 26 connected with the inner wall of the stable groove 25 in the middle of the placing frame 20 is connected through the connecting frame 28 rotatably connected at the upper end of the connecting seat 29, and the connecting seat 29 is fixed to the rear side of the middle of the fixed frame 8: the lifting of the placing frame 20 drives the stable block 26 to move forward under the limiting action of the inner wall of the stable groove 25, and the stable block 26 drives the synchronous displacement of the support frame 27 fixed at one end. Finally, the moving support frame 27 stably supports the pipe body part of the placed brake oil pipe body 2, realizes the effect of automatic support, thereby avoiding the error influence of the volume change caused by the pipe body bending on the detection result, and achieving the effect of improving the accuracy of the detection result of the sealing detection equipment; The role of the connecting frame 28 is to transmit the vertical displacement of the placing frame 20 to the stable block 26: when the placing frame 20 rises, the connecting frame 28 rotates around the rotation points of the connecting seat 29 and the stable block 26, pushes the stable block 26 to slide forward along the stable groove 25, and makes the support frame 27 extend and support the pipe body of the brake oil pipe body 2. If the connecting frame 28 is missing, the stable block 26 cannot move automatically with the displacement of the placing frame 20, and the support frame 27 cannot realize automatic support, which may affect the detection precision due to the pipe body bending, but does not affect the lifting displacement of the placing frame 20 itself.

[0029] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An air tightness testing device for an automobile brake oil pipe, comprising an air tightness testing instrument body (1) and a brake oil pipe body (2), wherein a ring joint (3) is fixed to one end of the brake oil pipe body (2), and a flared joint (4) is fixed to the other end of the brake oil pipe body (2), a display control screen (5) is provided on one side of the air tightness testing instrument body (1), a plurality of ventilation holes (6) are provided on both sides of the air tightness testing instrument body (1), and a power supply plug (7) is provided on the rear side of the air tightness testing instrument body (1), characterized in that: A fixing frame (8) is fixed to the upper end of the airtightness detector body (1), an air source tube (9) is fixed to one side of the fixing frame (8), a connecting line (10) is fixed to the other side of the fixing frame (8), a sealing detection probe (11) is fixed to one end of the connecting line (10), a first rubber ring (12) is fixed to the side of the fixing frame (8) close to the sealing detection probe (11), and a through groove (31) is opened in the middle of the fixing frame (8); The fixing frame (8) is provided with a slide groove (13) on the side close to the air source pipe (9), and an air injection hole (14) is provided on the upper side of the slide groove (13). A second rubber ring (15) is fixed on the side close to the air injection hole (14) of the fixing frame (8). The inner wall of the slide groove (13) is provided with a connecting structure, and a placement frame (20) is provided on the connecting structure; the connecting structure can move the placement frame (20) in the depth direction of the slide groove (13), so as to use the air source of the built-in air pump of the air tightness tester body (1) as the only driving force, and can drive the placed brake oil pipe body (2) to move without an additional driving device, so as to automatically complete the interface docking, thereby reducing the equipment cost and use cost.

2. The air tightness testing device for automobile brake oil pipe according to claim 1, characterized in that: The connecting structure comprises a slider (16), a third rubber ring (17) is fixed on the upper side of the slider (16), a fixed block (18) is fixed on the upper side of the slider (16), a connecting block (19) is fixed on the upper end of the fixing block (18), a placement rack (20) is fixed at both ends of the connecting block (19), a groove (30) is provided on one side of the placement rack (20), and the movement of the slider (16) is driven only by the air source pressure in the slide groove (13).

3. The air tightness testing device for automobile brake oil pipe according to claim 2, characterized in that: The outer surface of the slider (16) is slidably connected to the inner wall of the slide groove (13), and the cross-section of the slide groove (13) is T-shaped. One end of the air source pipe (9) is connected to the lower side of the slide groove (13), and the other end of the air source pipe (9) is connected to the built-in air pump of the air tightness detector body (1). The air injection hole (14) passes through one side of the fixing frame (8), and the second rubber ring (15) is set below the air injection hole (14). One end of the connecting line (10) is connected to the sealing detection probe (11), and the sealing detection probe (11) passes through the other side of the fixing frame (8). The other end of the connecting line (10) is connected to the air tightness detector body (1), and the first rubber ring (12) is set below the sealing detection probe (11).

4. The air tightness testing device for automobile brake oil pipe according to claim 2, characterized in that: The lower end of the third rubber ring (17) is fixed to the upper side of the slider (16), the lower end of the fixed block (18) is fixed to the middle of the upper side of the slider (16), the fixed block (18) is arranged in the third rubber ring (17), the fixed block (18) passes through the upper side of the slide groove (13), the upper end of the fixed block (18) is fixed to one side of the connecting block (19), the two ends of the connecting block (19) are fixed to the middle of the two ends of the placement frame (20), the outer surface of the connecting block (19) is slidably connected to the inner wall of the through groove (31), the outer surface of the placement frame (20) is slidably connected to the inner wall of the fixing frame (8), the vertical section of the fixing frame (8) is U-shaped, the outer surfaces of the annular joint (3) and the flared joint (4) are in contact with the upper surfaces of both sides of the placement frame (20), and the outer surface of the brake oil pipe body (2) is in contact with the inner wall of the groove (30).

5. The air tightness testing device for automobile brake oil pipe according to claim 1, characterized in that: The outer surface of one side of the placement rack (20) is slidably connected to two sliding racks (21), and rubber pads (22) are fixed to the adjacent sides of the two sliding racks (21). The upper ends of the two sliding racks (21) are rotatably connected to the connecting rack (23), and the other ends of the two connecting racks (23) are rotatably connected to the connecting seat (24). The connecting rack (23) drives the two sliding racks (21) to slide along the surface of the placement rack (20) and approach each other through angle changes, so as to improve the docking accuracy of the brake oil pipe annular joint (3) and the detection interface, thereby improving the equipment operation efficiency under air source drive.

6. The air tightness testing device for automobile brake oil pipe according to claim 5, characterized in that: The inner walls of the two sliding frames (21) are slidably connected to the outer surface of one side of the placement frame (20), the two sliding frames (21) are arranged opposite to each other, the middle parts of the two sliding frames (21) are hollowed out, and the sides of the two rubber pads (22) that are away from each other are respectively fixed to the sides of the two sliding frames (21) that are close to each other.

7. The air tightness testing device for automobile brake oil pipe according to claim 5, characterized in that: The proximal ends of the two connecting frames (23) are rotatably connected to the upper ends of the two sliding frames (21), and the separated ends of the two connecting frames (23) are rotatably connected to the lower ends of the two connecting seats (24). The vertical sections of the two sliding frames (21) are T-shaped, and the upper ends of the two connecting seats (24) are fixed to the two sides of the fixed frame (8) near the air injection hole (14).

8. The air tightness testing device for automobile brake oil pipe according to claim 1, characterized in that: A stabilizing groove (25) is provided in the middle of the placement frame (20), and a stabilizing block (26) is slidably connected to the inner wall of the stabilizing groove (25), and a support frame (27) is fixed to one end of the stabilizing block (26), and the other end of the stabilizing block (26) is rotatably connected to a connecting frame (28), and the upper end of the connecting frame (28) is rotatably connected to a connecting seat (29). When the placement frame (20) is displaced by the air source, the connecting frame (28) pushes the stabilizing block (26) to slide along the stabilizing groove (25), so that the support frame (27) automatically extends and supports the brake oil pipe body (2), so as to avoid detection errors caused by bending of the oil pipe due to its own weight.

9. The air tightness testing device for automobile brake oil pipe according to claim 8, characterized in that: The stabilizing groove (25) passes through the middle of the placement frame (20), the outer surface of the stabilizing block (26) is slidably connected to the inner wall of the stabilizing groove (25), the lower end of the stabilizing block (26) is fixed to the middle of the support frame (27), and the outer surface of the support frame (27) is in contact with the outer surface of the brake oil pipe body (2).

10. The air tightness testing device for automobile brake oil pipe according to claim 8, characterized in that: The upper end of the stabilizing block (26) is rotatably connected to the lower end of the connecting frame (28), the upper end of the connecting frame (28) is rotatably connected to the lower end of the connecting seat (29), the upper end of the connecting seat (29) is fixed to the rear side of the middle of the fixing frame (8), the vertical section of the connecting seat (29) is U-shaped, and the vertical section of the stabilizing block (26) is L-shaped.

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