98 results about "Flat tire" patented technology

The invention discloses a vehicle tire burst control method and system, a vehicle, control equipment and a storage medium, and relates to the technical field of vehicle safety control. The method mainly comprises the steps of determining the position of a tire burst wheel according to a vehicle tire burst signal, and identifying a driving scene according to vehicle state information; if the linear driving scene is recognized, acquiring tire braking force pressure according to the position of the flat tire wheel, calculating a yaw torque compensation value according to the tire braking force pressure, performing rear wheel steering adjustment, transferring a driving torque based on the position of the flat tire wheel, and performing vehicle body posture adjustment based on the position of the flat tire wheel; if the scene is recognized as the curve scene, controlling and changing the steering angle of the rear wheel based on the position of the flat tire wheel so as to adjust the yawing torque, transferring the driving torque based on the position of the flat tire wheel, and adjusting the posture of the vehicle body based on the position of the flat tire wheel. According to the vehicle tire burst control scheme, safer driving experience can be provided for the user, and the vehicle using experience and satisfaction degree of the user are improved.

The embodiment of the invention provides a vehicle control method and device and a vehicle. In the method, based on the tire pressure, the wheel speed and the IMU signal of the vehicle, whether the vehicle has a flat tire is determined. And after it is determined that the tire of the vehicle is punctured, stability control is conducted on the vehicle with the punctured tire according to the actual configuration of the whole vehicle, the position of the wheel with the punctured tire and the preset execution sequence of a vehicle stability control system. Through the method, more comprehensive and more accurate vehicle state information is provided based on the synergistic effect of the multi-sensor fusion-based tire burst monitoring and multi-stability control system and mutual complementation and verification of multi-sensor data, the probability of false alarm and missing alarm is reduced, and the accuracy and reliability of tire burst identification are improved; and through the coordination effect of various control systems, the vehicle can quickly recover to a stable state after tire burst. The defects of a traditional vehicle safety system in the aspects of tire burst event recognition and control are effectively overcome, and the safety and stability of the vehicle are improved.

The utility model belongs to the technical field of run-flat tire testing equipment, and particularly relates to a run-flat tire anti-puncture testing device which comprises a workbench, a first thread and a second thread are respectively and fixedly arranged on one side of the circumferential surface of a screw in a mirror image mode, the thread directions of the first thread and the second thread are opposite, a first moving ring is rotatably arranged on the first thread, and a second moving ring is rotatably arranged on the second thread. A first movable ring is rotatably arranged on the second thread, a first supporting rod is rotatably arranged on the first mounting lug through a rotating rod, the second supporting rod rotates through the rotating rod and penetrates through the rectangular through hole, a connecting plate is arranged at one end of the first supporting rod, and a T-shaped guide groove is formed in one side of the connecting plate; and the third mounting lug and the fourth mounting lug are rotationally connected with one end of a first supporting rod and one end of a second supporting rod through rotating rods correspondingly, an arc-shaped fixing plate is fixedly arranged on the other side of the connecting plate, through cooperation of the structures, corresponding adjustment can be conducted according to anti-explosion tires of different sizes, and the application range of equipment is widened.

The invention relates to the technical field of calender cooling, in particular to an automatic calender for industrial and mining vehicle load-carrying run-flat tire cord fabric production, which comprises a calender, a support frame is arranged on the side edge of the calender; a plurality of first cylinders are rotationally connected to the supporting frame. A plurality of motors are fixedly connected to the supporting frame. The space between the first cylinder and the second cylinder is divided into a plurality of independent first cavities through cooperation of the first circular rings and the partition plates, cooling liquid circumferentially flows in all the independent first cavities, the heat dissipation effects of the second cylinder at different positions in the front-back direction are the same, and therefore the cooling effects of the cord fabric piece at different positions in the front-back direction are the same, and the cooling effect of the cord fabric piece at different positions in the front-back direction is improved. The cooling and plasticizing uniformity of all positions of the curtain cloth piece is improved, the situation that the product quality is affected due to the fact that the cooling and plasticizing degree difference of all the positions is too large is avoided, meanwhile, the partition plate originally used for separating the first cavity can also be used for scraping water scale remaining on the inner side of the second cylinder, the structure is compact, and meanwhile the cleaning difficulty is reduced.

The present invention discloses a wheel, which includes a hub, a ring-shaped tread, and support blocks disposed between the hub and the ring-shaped tread. A gas storage chamber for storing compressed air or inert gas is provided inside the hub. The wheel of the present invention has no risk of flat tires or air leakage, and is more economical and environmentally friendly for replacement and maintenance; moreover, the wheel can bear higher air pressure, has higher stiffness performance and lower rolling resistance. The present invention also discloses a vehicle.

The utility model discloses a tire separating device which comprises an adjusting mechanism, a fixing mechanism is arranged below the adjusting mechanism, and a separating mechanism is arranged on the adjusting mechanism. And the separating mechanism comprises a fixing base, a winding roller is rotationally arranged on the fixing base, a second motor is installed at one end of the winding roller, a rope is wound around the winding roller, and a limiting block is hung at the bottom of the rope. According to the device, the supports are arranged on the flat tire, meanwhile, the tire is located between the two clamping plates, the first motor is started to drive the lead screw to rotate, the supports on the lead screw are driven to be folded in the polished rod direction, the anti-skid grooves make contact with the tire to complete fixation, and the device is suitable for various types of tires while achieving rapid installation and is high in practicability; the limiting block is inserted into the rim, after the two ends of the limiting block are stably placed, the second motor is started to drive the winding roller to rotate, the rope lifts the limiting block, interaction force of the limiting block and the support acts on the rim and the tire, the separation process saves time and labor, and operation is convenient.

This rubber composition is characterized by comprising a diene-based rubber component and a filler containing recycled carbon black, and is characterized in that: the diene-based rubber component includes a butadiene-based rubber; when the recycled carbon black is measured using a grind gauge, 3 or more lines having a length of 10 mm or more are observed; and, among particles forming the lines having a length of 10 mm or more, the particle size of particles having the third largest size is 20 µm or less.

The utility model discloses a run-flat tire, which relates to the technical field of tire manufacturing and comprises an outer tire body, tread patterns are arranged on the surface of the outer tire body, a tire body reinforcing material is arranged in the outer tire body, a side reinforcing rubber layer with a crescent-shaped section is arranged on the inner side of a tire body layer at the tire side part of the outer tire body in a spanning manner, and a tire bead filler component is arranged on the side surface of the tire body reinforcing material. A bead ring component is arranged on the side face of the tire bead filler component, a belt mechanism is arranged between the outer tire body and the tire body reinforcing material, a stabilizing device is arranged on the side face of the tire bead filler component, the shore hardness of the tire bead filler component ranges from 70 degrees to 82 degrees, the thickness of the maximum broken width position accounts for 40%-60% of the total thickness, and on the basis that the run-flat function can be stably maintained, the service life of the tire is prolonged. The design is weakened as much as possible, and the bending difficulty of the side wall is reduced, so that the problem of stress concentration of the ring part caused by vulcanization die assembly can be improved, and meanwhile, the product comfort is improved.

The utility model discloses an anti-explosion double-tire wheel structure. The anti-explosion double-tire wheel structure comprises a hub, a rim, an inner tire and an outer tire, the rim and the hub are fixed on the outer edge of the hub; two tire grooves are formed in the rim through the side check rings. A group of inner tire and outer tire can be embedded in each of the two tire grooves; the outer tire comprises a tire outer wall, a tire inner wall and a tire bottom wall; the tire inner walls of the two outer tires are attached to each other; and the tire inner wall and the tire bottom wall are in small arc-shaped edge transition. According to the utility model, when a certain group of tires burst or leak air in the use process, the other group of tires can work independently, so that traffic accidents caused by the fact that a vehicle body loses balance and the direction is out of control are avoided, and maintenance can be carried out after freight driving is completed. The appearance effect and the load-bearing performance of a large-tire-width tire can be reflected, the cost is only the price of two small-tire-width tires, the explosion-proof driving is realized, the maintenance and replacement cost is low, and the favor degree of a small truck driver is high.

The present invention provides a tire building drum having an attachment surface for receiving a first tire layer and two axially spaced support sections, wherein the first tire layer extends axially across the two support sections. Each support section is provided with a plurality of rotating bodies uniformly distributed along the circumference. The plurality of rotating bodies can be driven to rotate in the same direction and synchronously positioned at a first or second position. The rotational radii of the plurality of rotating bodies overlap but do not interfere with each other. In the first position, the support section forms a first support surface for supporting the first tire layer, and the first support surface and the attachment surface are located on the same circumferential surface. In the second position, the support section forms an annular recessed portion, on which a second support surface is formed, and the second support surface is lower than the attachment surface. Thus, the tire building drum provided by the present invention selectively provides a first or second support surface at the support section by driving the plurality of rotating bodies to rotate, thereby meeting the requirements of the various stages of the building process for high-quality run-flat tires.

The application provides a tire forming drum, which comprises a main shaft, a middle ring and two half-drum devices symmetrically arranged relative to the middle ring. The half-drum device comprises an outer shaft sleeved on the main shaft, a limiting disc fixed to one end of the outer shaft close to the middle ring, a turn-up assembly, a turn-up driving assembly, a guide body matched with the turn-up assembly and a bead locking assembly located on the side of the limiting disc away from the middle ring. The tire forming drum further comprises a fixed ring body fixedly connected with the limiting disc and having a body part in the shape of a ring and an extension part extending axially from the body part towards the middle ring; and a movable ring body arranged between the extension part and the middle ring in the radial direction and axially movable, and the cooperation between the fixed ring body and the movable ring body forms an annular recess. Thus, the tire forming drum provided by the application not only can provide a flat circumferential surface extending axially, but also can form an annular recess for accommodating a rubber reinforcing member, so as to realize the forming of a tire body assembly in a run-flat tire blank in a one-step tire forming machine.

The invention provides tire dismounting and mounting equipment. The tire dismounting and mounting equipment comprises a tire dismounting structure, the pressing wheel structure is arranged on the tire dismounting structure; the tire dismounting structure is movably arranged in the preset direction so as to drive the wheel pressing structure to be close to or away from the to-be-dismounted tire. When the pressing wheel structure is close to the to-be-detached tire, the pressing wheel structure is in contact with an outer tire of the to-be-detached tire to apply acting force to the outer tire, so that a tire detaching opening is formed between the outer tire of the to-be-detached tire and a hub; the tire dismounting hook is arranged on the tire dismounting structure, so that the tire dismounting structure drives the tire dismounting hook to be close to the tire dismounting opening; the tire dismounting hook is movably arranged relative to the tire dismounting structure so as to extend into the tire dismounting opening, and the outer tire of the tire to be dismounted and the hub of the tire to be dismounted are dismounted and separated. The problems that in the prior art, a flat tire and a new energy automobile tire are not prone to positioning and hooking in the dismounting process, and time and labor are wasted are solved.

The invention provides a mixing device, a bottle unit and a flat tire repair kit capable of efficiently repairing a flat tire of an object. The mixing device (4) is used for mixing the flat tire repair liquid (R) with the compressed air (A). A mixing device (4) is provided with: a mixing chamber (8) having a space for mixing a flat tire repair liquid (R) with compressed air (A); a first inlet (9) for supplying compressed air (A) to the mixing chamber (8); a second inlet (10) for supplying the puncture repair liquid (R) to the mixing chamber (8); and an outlet (11) for discharging the mixture of the puncture repair liquid (R) and the compressed air (A) from the mixing chamber (8). The second inlet (10) is provided with at least one flow path (16) having a slit shape having a cross-section in the longitudinal direction.

The invention relates to the technical field of tire systems, and provides a supporting type run-flat tire system which can still ensure the basic supporting effect of a vehicle body when a tire is lack of air, so that the normal driving posture deviation of the vehicle body is small, the vehicle body is more practical, the linkage among all parts is good, and the matching applicability is good. Comprising a tire body, an in-tire structure and an auxiliary suspension, a hub is installed on the tire body in a matched mode, the in-tire structure comprises a plurality of first inner attaching plates and a plurality of second inner attaching plates, the first inner attaching plates and the second inner attaching plates are all matched with the hub, and the first inner attaching plates and the second inner attaching plates are all slidably connected with telescopic frames; the multiple first inner attaching plates and the multiple second inner attaching plates are fixedly connected with elastic springs, the multiple elastic springs are fixedly connected with the multiple telescopic frames, the multiple telescopic frames are fixedly connected with arc-shaped outer supporting frames, the multiple arc-shaped outer supporting frames are slidably connected with arc-shaped inserting plates, and the multiple arc-shaped outer supporting frames are provided with arc-shaped inserting grooves.

The utility model provides a three-ring type explosion-proof motor vehicle tire, which belongs to the field of motor vehicle tires and comprises a hub, a three-ring explosion-proof mechanism is arranged on one side of the hub, and a reinforcing component is arranged on one side of the three-ring explosion-proof mechanism. Through the arrangement of the three-ring explosion-proof mechanism, the effect that a motor vehicle can still be supported to run normally when a single inner tube is punctured is achieved, through the puncture-resistant fiber layer, the puncture-resistant capacity of the inner tube can be greatly improved, the explosion-proof effect is improved, and through the arrangement of the three explosion-proof inner tubes, even if one inner tube is punctured, the explosion-proof effect is improved. When the motor vehicle runs normally, the rest two inner tubes can still support the motor vehicle to run normally, so that traffic accidents caused by vehicle unbalance are prevented, and the problems that in the prior art, only an independent inner tube is used, under the conditions of high speed, high temperature and high friction, tire burst is easily caused, the vehicle loses balance and cannot run continuously, and then traffic accidents occur are solved.

The present invention provides a puncture-proof and run-flat tire with a spare tire that could be rapidly assembled and be adaptive to an tire body by finely adjusted and locked, thereby providing puncture-proof and run-flat function. The puncture-proof and run-flat tire includes an tire body having two protruding hooks on two inner edges on two sides of an inner ring of the tire body and a spare tire tightly engaged with one of the two protruding hooks of the tire body. Therefore, a vehicle could continue travelling safely if the tire body becomes flat due to damage caused by foreign objects. The spare tire includes a plurality of spare tire blocks assembled with an elastic ring, a first fine-adjustment wire, and a second fine-adjustment wire. Therefore, the spare tire could be rapidly mounted on the protruding hooks of the tire body to form the puncture-proof and run-flat tire.

The present invention discloses a safety tire inner support mechanism capable of improving the ground adhesion performance after a flat tire, which comprises an inner support base and a support device. The inner support base is fixedly installed on the surface of the rim, and an installation groove is arranged inside the inner support base. The support device is arranged in the installation groove. The support device includes a driving mechanism and an extended support body. The driving mechanism includes a detection support body, two sets of driven gear sets and two sets of accelerating gear sets. The detection support body includes a detection support body crown and a detection support body stem. The extended support body includes an extended support body crown, an extended support body stem and an extended support body truss. The support device further includes a locking mechanism. After the tire has a flat tire, the driving mechanism can drive the extended support body to unfold and lock, providing support force for the tire. The device of the present invention can unfold within a short time when the inner support contacts the ground, increasing the grounding area of the inner support, effectively reducing the out-of-control risk after a flat tire, and improving the stability and safety of the vehicle's zero-pressure continuous driving.

The present invention discloses a self-triggering flat tire simulation device, which relates to the technical field of vehicle test devices. It includes a fixed disk installed on a wheel hub. On the side of the fixed disk away from the wheel hub, there are a fixed bracket and a spring. The fixed bracket is coaxially arranged with the wheel hub. The top of the fixed bracket is connected with a hanging bracket, and the end of the hanging bracket is hinged with a seesaw. At one end of the seesaw away from the fixed bracket, a puncturer is installed, and the puncturer is within the range of the tire. At the bottom of the end of the seesaw close to the fixed bracket, it abuts against the top of the spring; in the middle of the fixed bracket, there is a sliding hole parallel to the fixed disk, and a sliding rod is slidably arranged in the sliding hole. At one end of the sliding rod close to the seesaw, there is a limiting plate, and the limiting plate is on the top of the spring, and the bottom of the limiting plate abuts against the top of the seesaw; at the end of the sliding rod away from the seesaw, there is a counterweight ball. The present invention utilizes centrifugal force to achieve a self-triggering effect, improves the suddenness and randomness of a flat tire, does not require manual remote control triggering, and the whole adopts a mechanical structure without wiring.

The utility model relates to a kind of modularization superposition type heavy vehicle wheel auxiliary support moving mechanism of road clearing equipment technical field, including supporting wheel frame, wheel shaft and gyro wheel group, supporting wheel frame includes a group of side support, several parallel support connecting rods are fixed between two side supports, the arc-shaped support portion capable of supporting heavy vehicle wheel is formed between each support connecting rod, and it further includes at least one modularization cushion block capable of being placed on arc-shaped support portion.The utility model is matched with modularization cushion block by the supporting wheel frame of split design, can sequentially stack modularization cushion block on supporting wheel frame, so as to match the wheel of different vehicle models and its various accident states (including flat tire, no tire, no tire and no steel ring, no hub etc.), wheel can be raised according to the actual situation of wheel and its various accident states, so that each wheel of accident vehicle is at the same height, while avoiding the relative motion of wheel and supporting wheel frame, thereby greatly improving the safety, rapidity and effectiveness when wrecker clears obstacles.

Provided is a side reinforcement rubber for run-flat tires which contributes to improving sustainability. The side reinforcement rubber for run-flat tires is characterized by the use of a rubber composition that contains a rubber component and a filler including recovered carbon black.

The present invention provides a run-flat tire excellent in high-temperature softening inhibition, and a rubber composition from which the tire can be produced. The rubber composition contains a rubber component, a filler, a vulcanizing agent, and a vulcanization accelerator that contains a sulfenamide-based vulcanization accelerator and 1.0 to 2.0 parts by mass of tetrabenzylthiuramdisulfide based on 100 parts by mass of the rubber component, in which a mass ratio (a / b) of a content (a) of the tetrabenzylthiuramdisulfide to a content (b) of the sulfenamide-based vulcanization accelerator is 0.60 to 1.25.

The invention relates to the technical field of bicycle tires, and discloses a low-flatness bicycle tire which comprises a flat tire body, a wear-resistant ring is arranged in the flat tire body, a supporting layer is fixedly connected to the interior of the wear-resistant ring, a microcapsule is fixedly connected to the interior of the supporting layer, the outer wall of the microcapsule is fixedly connected to the inner wall of the wear-resistant ring, and the outer wall of the microcapsule is fixedly connected to the inner wall of the wear-resistant ring. An anti-puncture layer is fixedly connected to the interior of the supporting layer, microcapsules are fixedly connected to the interior of the anti-puncture layer, the outer wall of the anti-puncture layer is fixedly connected to the other side of the outer wall, and a connecting assembly is slidably connected to the interior of the flat tire. Through the cooperation between the flat tire and the micro air bag, the low flat tire has faster acceleration, better supporting performance, more sensitive control performance and faster response speed, the low flat ratio bicycle tire is more fashionable and dynamic visually, and meanwhile, through the cooperation of the air leakage prevention component, the low flat ratio bicycle tire is more convenient to use. The tire can be automatically repaired when small puncturing or cutting occurs, and the tire burst risk is reduced.

The utility model discloses a run-flat tire which comprises a plurality of groups of first supporting mechanisms which are arranged around an air chamber, one side of each first supporting mechanism corresponds to a tire tread, the other side of each first supporting mechanism is connected with a tire bead, and each first supporting mechanism comprises a movable part and a bendable part which are connected with each other; the movable part comprises a first part and a second part, the first part extends in the first direction and is located on the top face of the air chamber, and the second part extends in the radial direction and is located on the side face of the air chamber. One end of the bendable part is connected with the tire bead, and the other end is connected with the second part; the plurality of groups of first supporting mechanisms can be switched from a first state to a second state; in the first state, the bendable part is not bent, and a gap is formed between every two adjacent first parts; and in the second state, at least one group of bendable parts are bent, and the first part is stacked with the adjacent first part along the circumferential direction. The first supporting mechanisms of the run-flat tire can push each other during air leakage or tire burst, so that sinking is prevented, and bumping of a vehicle is greatly reduced.

The present invention provides a puncture-proof and run-flat tire with a spare tire that could be rapidly assembled and be adaptive to an tire body by finely adjusted and locked, thereby providing puncture-proof and run-flat function. The puncture-proof and run-flat tire includes an tire body having two protruding hooks on two inner edges on two sides of an inner ring of the tire body and a spare tire tightly engaged with one of the two protruding hooks of the tire body. Therefore, a vehicle could continue travelling safely if the tire body becomes flat due to damage caused by foreign objects. The spare tire includes a plurality of spare tire blocks assembled with an elastic ring, a first fine-adjustment wire, and a second fine-adjustment wire. Therefore, the spare tire could be rapidly mounted on the protruding hooks of the tire body to form the puncture-proof and run-flat tire.

The present invention addresses the problem of providing a rubber composition having improved heat resistance while suppressing blooming and ensuring tackiness. The means for solving the problem is a rubber composition containing a rubber component, two or more sulfenamide-based vulcanization accelerators, and one or more thiuram-based vulcanization accelerators, wherein the content of each of the two or more sulfenamide-based vulcanization accelerators is 3.7 parts by mass or less per 100 parts by mass of the rubber component, and the total content of the two or more sulfenamide-based vulcanization accelerators is 4 parts by mass or more per 100 parts by mass of the rubber component.

The invention provides an extrusion line universal puncturing device, and relates to the technical field of tire processing, the extrusion line universal puncturing device comprises a base and supports, the two supports are arranged on the two sides of the upper portion of the base respectively, I-shaped sliding blocks are movably arranged on the inner sides of the two supports, and the I-shaped sliding blocks are driven to move through thread parts; front grooves are formed in the front ends of the two groups of brackets; the first two-way thread part drives the pricking needle base to move, the relative position between the pricking needles on the two sides is changed, it is guaranteed that pricking can be conducted according to the process spacing requirement, the two sets of supporting wheels are synchronously driven to move through the second two-way thread part, so that the spacing of the grooves in the two sides is matched with the pricking needles on the two sides, and the I-shaped sliding block is driven to move through the thread part; the height of the pricking needle is changed, the pricking needle is matched with the supporting wheel for supporting to puncture the supporting rubber, gas can be discharged through a hole of the supporting rubber and a cord fabric layer during forming, the device is simple and easy to operate, and the problem of tire blank bubbles of the run-flat tire can be solved after puncturing.

The utility model discloses an explosion-proof supporting body tire which comprises a rim, supporting bodies fixedly distributed on the rim and an outer tire wrapped outside the supporting bodies, each supporting body comprises two or more supporting blocks, every two adjacent supporting blocks are connected through a fastener, and limiting lugs are arranged on the supporting blocks. Compared with the prior art, the anti-explosion supporting body tire has the advantages that the radial movement of the supporting body and the rim is limited by the friction force after the supporting block and the rim are locked, and the axial movement of the supporting body and the rim is limited by the limiting lugs, so that the radial and axial stability of the anti-explosion supporting body tire is ensured; it is ensured that the tire can provide normal driving force and braking force after tire burst, and the purpose of safely evacuating passengers is achieved.

The utility model discloses a tire burst detection sensor and a vehicle, the tire burst detection sensor comprises a tire burst shell, a sealing diaphragm is arranged in the tire burst shell, the sealing diaphragm divides an inner cavity of the tire burst shell into a first cavity and a second cavity, and the circulation sectional area of a capillary tube is smaller than that of a communication port; the sealing diaphragm is suitable for deforming when the pressure in the second cavity is greater than that of the first cavity and enabling the electric control structure to send out a tire burst signal; the capillary tube is integrally formed in the wall face of the tire burst shell in an injection molding mode. According to the tire burst detection sensor, triggering is timely and efficient, mistaken touch is avoided, the safety performance of a vehicle is greatly improved, the structure is simple, cost is reduced, the overall height of the tire burst detection sensor is reduced, interference between the tire burst detection sensor and the rim of a tire hub is avoided when the tire burst detection sensor is installed, and the safety of the vehicle is improved. The reliability of the tire burst detection sensor is improved, and the application range is wide.

The invention provides a testing device, which is used for a deaeration test of a vehicle tire and comprises a base, a one-way valve, an air pump and an electric control valve. The base is connected with a hub of a vehicle tire, and an airtight cavity used for being connected with an air cavity of the vehicle tire is formed in the base. A first channel end of the one-way valve is connected with the airtight cavity; an air outlet of the air pump is in butt joint with the second channel end of the one-way valve, the one-way valve is configured to stop air inflow from the first channel end to the second channel end and conduct air inflow from the second channel end to the first channel end, and the air pump is used for pumping air into the airtight cavity through the one-way valve so as to inflate vehicle tires; and the electric control valve is connected with the airtight cavity and is used for selectively communicating the airtight cavity with the atmosphere so as to deflate the vehicle tire. In this way, the testing efficiency of the testing device can be effectively improved.

The invention provides a mixing device capable of suppressing reverse flow of puncture repair liquid when supply of compressed air is stopped. The mixing device according to the present invention comprises: a mixing chamber in which a space for mixing a flat tire repair liquid with compressed air is defined; a first inlet for supplying compressed air to the mixing chamber; a second inlet for supplying the puncture repair liquid to the mixing chamber; and the outlet is used for discharging the mixture of the flat tire repair liquid and the compressed air from the mixing chamber. The mixing chamber includes an upper member defining a top surface of the space in a use state, and a lower member defining a bottom surface of the space. A second inlet (8) is formed in the upper member. The upper member moves in a direction away from the bottom surface by the supply of compressed air to communicate the second inlet, the first inlet, and the outlet via the mixing chamber, and moves toward the bottom surface by stopping the supply of compressed air to close the communication of the second inlet, the first inlet, and the outlet.