WO2013040808A1

WO2013040808A1 - Tire post-inflation device

Info

Publication number: WO2013040808A1
Application number: PCT/CN2011/080475
Authority: WO
Inventors: 张正罗
Original assignee: 华澳轮胎设备科技（苏州）有限公司
Priority date: 2011-09-21
Filing date: 2011-09-30
Publication date: 2013-03-28
Also published as: CN102357958B; CN102357958A

Abstract

A tire post-inflation device comprises a support beam (1), a locking rod (2), a center rod (5), an upper tray (3) and a lower tray (4) coaxially disposed; the upper tray (3) is sleeved on the locking rod (2); the upper end of the upper tray (3) is fixedly connected to the support beam (1); the center rod (5) is provided with an engagement end (50) and a positioning end (51) thereon; the non-locking end of the locking rod (2) is provided with an axially threaded hole; the engagement end (50) is provided with external threads thereon; the locking rod (2) forms a screw transmission with the center rod (5) by utilizing the screwable connection between the threaded hole and the engagement end (50); the locking rod (2) axially reciprocates via the rotation and the screw transmission of the center rod (5). The device utilizes the up and down reciprocation of the locking rod (2) to adjust the rim width; the upper tray (3) is fixed on the support beam (1), is stationary in the whole working process of the post-inflation device, and is coaxial with the lower tray (4) with a high precision, such that the tire is unlikely to deform.

Description

Rear tire inflation device

The invention relates to a post-tire inflation device for shaping and cooling a tire after vulcanization.

Background technique

At present, most of the rear inflators of domestic tire setting vulcanizers use the position of adjusting the upper or lower chuck to determine the width of the rim that conforms to the specifications of the tire to be determined.

The rear tire inflation device shown in FIG. 1 includes a support beam 1 1 , a lock lever 12 , a coaxially disposed upper tray 13 and a lower tray 14 , and the upper tray and the upper chuck together form an upper chuck assembly. The lower tray and the lower chuck together form a lower chuck assembly, the locking rod 12 is fixed on the support beam 1 1 , and the upper tray 13 is sleeved on the locking rod 12; the lower tray 14 is covered by the inner tray 140 and the sleeve The outer disk holder 141 is disposed on the inner disk holder, and the inner disk holder 140 and the outer disk holder 141 are screwed by a screw. When the outer disk holder 141 is rotated, the outer disk holder 141 has a reciprocating motion along the inner disk holder 140. The rear tire inflator utilizes the position of the outer tray of the lower tray in the axial direction to meet the rim width requirements of various gauge tires. When working, first rotate the outer tray of the lower tray so that it moves down or upward along the inner disc holder until the lower chuck is driven by the outer disc holder to the position required by the width of the rim.

The post-tire inflator further includes a drive cylinder 15 for pre-pressing prior to inflation of the tire. The driving cylinder 15 is fixed on the support beam 1 1 , and the output end of the cylinder rod is fixedly connected with the upper end of the upper tray 13. The upper chuck assembly has a reciprocating motion along the locking rod under the driving of the driving cylinder rod. The rear tire inflator utilizes adjusting the position of the upper chuck assembly in the axial direction to achieve preloading prior to post-inflating of the tire. As shown in Figure 1, during operation, the drive cylinder is actuated and the cylinder rod extends or retracts, causing the upper chuck assembly to move downward or upward along the lock lever until the upper chuck assembly reaches the desired position of the preload stroke.

The rear tire inflating device uses the screw transmission between the inner disc holder and the outer disc holder of the lower tray to adjust the axial position of the lower chuck, thereby adjusting the rim width; and then adjusting the position of the upper chuck assembly in the axial direction, Given a tire after inflating The pre-pressing stroke in the process ensures the quality of the tire.

Both the upper tray and the lower tray of the rear tire inflator need to move in the axial direction. Due to the gap between the gaps or the long-term wear, the axes of the upper and lower trays are inclined, so that the two axial directions are not Repeat again. When the tire is chucked on the upper and lower chucks, the accuracy of the tire will be affected due to the poor coaxiality of the upper and lower trays, and the tire is prone to deformation.

In order to solve the above problems, it is necessary to design a tire rear tire shaping device capable of accurately controlling the coaxiality of the upper and lower trays and improving the quality of the tire setting.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a rear tire inflation device which is improved in structure, and has high coaxiality accuracy of the upper and lower trays, and the tire is not easily deformed.

In order to achieve the above object, the technical solution adopted by the present invention is: a rear tire inflation device, comprising a support beam, a lock lever, a coaxially disposed upper tray and a lower tray, wherein the upper tray is sleeved on the locking rod, The upper end of the upper tray is fixed to the support beam; the rear airing device further includes a center rod supported on the support beam and rotating around the axis thereof, and the center rod is provided with a joint end and a positioning end. The non-latching head end of the lock lever is provided with an axial threaded hole, and the joint end is provided with an external thread, and the lock rod is screwed with the center rod by screwing between the threaded hole and the joint end, The rotation of the lock lever through the center rod and the screw drive have an axial reciprocating motion.

The upper tray and the upper chuck together constitute the upper chuck assembly, and the lower tray and the lower chuck together constitute the lower chuck assembly, and the tire is clamped between the upper and lower chucks when the mold is set.

In the above technical solution, the rear inflator further includes a latching operating mechanism, the latching operating mechanism includes a latching gear, a latching gear shaft, and a wrench fixedly coupled to the latching gear shaft, the latching gear being fixedly coupled to the latching lever and supported The locking gear shaft rotating on the support beam about its own axis is disposed in parallel on the side of the locking rod, and the locking rod is driven around the locking rod by the meshing transmission between the locking gear and the locking gear shaft. The rotation of the axis.

In the above technical solution, the position of the support beam corresponding to the center pole is opened. a positioning hole, the positioning end of the center rod passes through the positioning hole and is supported on the support beam by a positioning mechanism, the center rod is drivingly connected with a driving mechanism, and the driving of the center rod through the driving mechanism has The rotation of its own axis.

In a further technical solution, the positioning mechanism is a Hough structure, which is fixed by two symmetrical bearing bushes, and a positioning end of the center bar is provided with a step, and an end surface of the step is supported at one end of the positioning mechanism. The other end of the positioning mechanism is pressed against the support beam.

In the above technical solution, the driving mechanism includes a geared motor, a worm wheel and a worm, the geared motor is fixed on the support beam, and the worm is fixedly connected with an output shaft of the geared motor, and the worm wheel and the center rod are The positioning end is fixedly connected.

In the above, the driving mechanism may be further composed of a reduction motor, a chain, a driving sprocket and a driven sprocket engaged with the chain, the reduction motor is fixed on the support beam, and the driving sprocket is fixed to the deceleration The output sprocket of the motor is fixed to the positioning end of the center rod.

In the above technical solution, the rear inflator further includes an anti-rotation rod, the upper end of the locking rod is provided with an annular groove, and the locking end of the lower end of the locking rod is provided with at least two first locking teeth, and the lower tray is The upper end is provided with an equal amount of second locking teeth which form a wrong tooth structure with the first locking teeth, and the upper tray is provided with an anti-rotation hole whose axis is parallel to the axis of the locking rod, and one end of the anti-rotation rod is provided at The end of the anti-rotation rod is inserted into the annular groove, and the other end of the anti-rotation rod is simultaneously inserted into the anti-rotation hole and the tooth groove between the two second locking teeth.

In the above technical solution, the rear inflatable device comprises a column, a four-station and two lifting devices, each of the stations comprises an upper tray, a lower tray and a locking rod, and the left and right sides of the column are respectively provided with two The two stations of the same side of the column are respectively disposed on the upper and lower sides of the support beam and share the support beam, and the lifting device is disposed on each of the left and right sides of the column, and the lifting device is disposed at the same Below the two stations on the side, and the lifting device is detachably connected to the lower tray of the adjacent station by the engaging structure.

According to a further technical solution, the two stations located on the same side of the column share the same Center pole.

According to a further technical solution, after the lower tray is inserted into the locking rod, the lower end surface of the anti-rotation rod is higher than the lower end surface of any of the first locking teeth. With the above structure, the anti-rotation bar realizes the restriction of the rotation of the lower tray, thereby preventing the lower tray from coming off due to accidental rotation during the disengagement of the lower lifting device; at the same time, the anti-rotation lever does not interfere with the first locking tooth.

The locking lever and the lower tray are connected by a wrong tooth structure, the locking lever is provided with six first locking teeth, and the lower tray is provided with six second locking teeth, but not limited to six , can also be 4 or 8. Rotating the locking gear by rotating a wrench fixedly connected with the locking gear shaft, thereby rotating the locking gear and the locking rod together by a certain angle, so that the first and second locking teeth respectively disposed on the locking rod and the lower tray are staggered or relatively. When there are 6 teeth on the lock lever and the lower tray, the lock lever can be locked or unlocked by only 30 °, so the lock gear can be selected as a non-round gear. Preferably, the center angle of the locking gear is 60 °, ie the locking gear is only 1 / 6 circle.

The inflating device includes five steps of adjusting the rim width, lower tray lifting, locking, pre-pressing and aerating. The specific working process of any station is as follows:

(1) determining the rim width according to the specifications of the tire to be shaped;

(2) Starting the motor of the drive mechanism, rotating the center rod around its own axis under the drive of the gear drive, and moving the lock rod axially through the screw drive between the center rod and the lock rod until the lock head of the lock rod reaches the rim The position required for the width;

(3) The driving device drives the air intake of the cylinder to raise the lifting device to the lower tray, and uses the engaging structure to combine the lifting device with the lower tray;

(4) Rotate the wrench of the locking control mechanism to make it rotate 30 °, so that the teeth and slots respectively arranged on the locking lever and the lower tray are opposite to realize the loose lock;

(5) The driving cylinder of the lifting device is exhausted, and the lifting device drives the lower chuck assembly to move down to the lower side of the tire conveying device;

(6) starting the tire conveyor and transporting the tire to be coaxial with the upper and lower chuck assemblies; (7) The lifting device drives the cylinder air intake, and the lifting device drives the lower chuck assembly and the tire to rise until the distance between the lower chuck and the upper chuck is the rim width minus the preloading stroke;

(8) Rotate the wrench of the locking control mechanism to make it rotate through 30°, so that the teeth placed on the locking lever and the lower tray are opposite each other to achieve locking;

(9) inflating the inner cavity of the tire from the inflation hole provided on the upper tray;

(10) The lower chuck assembly is slowly moved down by the lifted tire until the teeth on the lower tray bear against the teeth on the lock lever to the desired position of the rim width.

(11) Open the engaging mechanism to separate the lifting device from the lower tray;

(12) The driving cylinder of the lifting device is exhausted, and the lifting device is moved down to the lower side of the tire conveying device;

( 13) The tire of this station enters the pressure holding and setting state.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art.

1. The present invention utilizes the up and down reciprocating motion of the lock lever to adjust the rim width, and fixes the upper tray to the support beam. During the entire operation of the rear inflatable device, the upper tray remains stationary, and the upper tray is coaxial with the lower tray. The degree of precision is high and the tire is not easily deformed.

2. In the invention, the lifting device is used to realize the pre-pressing when the lower tray is jacked up, and the adjustable range of the pre-pressing stroke is the distance between the locking head of the locking rod and the bottom of the lower tray, and the adjustable range is large; A pre-pressure adjusting device is added, and the entire rear inflatable structure is simple and low in cost.

3. The present invention utilizes the anti-rotation bar to limit the abnormal rotation of the lower tray, thereby preventing the lower tray from falling off due to accidental rotation during the escape of the lifting device, and being safer.

DRAWINGS

Figure 1 is a partial cross-sectional view of a rear tire inflation device in the prior art; Figure 2 is a front elevational view of the first embodiment of the present invention;

Figure 3 is a partial cross-sectional view of a station in the first embodiment;

Figure 4 is a cross-sectional view taken along line AA of Figure 3; Figure 5 is a cross-sectional view taken along line BB of Figure 3,

Figure 6 is a cross-sectional view of the lock lever of the first embodiment;

Figure 7 is a cross-sectional view of the upper tray of the first embodiment;

Figure 8 is a cross-sectional view of the lower tray of the first embodiment;

One - p^i

Figure 9 is a partial view of the center pole in the first embodiment.

Figure 10 is a schematic view of the locking rod of Figure 3 when it is lowered to the lowermost state; Figure 1 is a schematic view showing the positional relationship of the two stations on the same side of the column in the first embodiment;

Figure 12 is a cross-sectional view taken along line C-C of Figure 4 in a locked state;

Figure 13 is a cross-sectional view taken along line C-C of Figure 4 in an unlocked state;

14 is a schematic structural view of a driving mechanism according to Embodiment 2 of the present invention; wherein: 1. a support beam; 2. a locking lever; 20, an annular groove; 2, a first latching tooth; 3. an upper tray; 4, lower tray; 40, second locking tooth; 5, center rod; 50, joint end; 5 1, positioning end; 52, positioning mechanism; 6, locking mechanism; 60, locking gear; 6 1, blocking Gear shaft; 62, wrench; 7, drive mechanism; 70, motor; 7 1, worm gear; 72, worm; 73, motor; 74, chain; 75, drive sprocket; 76, driven sprocket; 9; column; 10, lifting device; 1 1, support beam; 12, locking bar; 13, upper tray; 14, lower tray; 140, inner disc holder; 141, outer disc holder; 15, drive cylinder.

detailed description

The present invention is further described below in conjunction with the accompanying drawings and embodiments:

Embodiment 1: Referring to FIG. 2 and FIG. 3, a rear tire inflation device includes a support beam 1, a lock lever 2, a center pole 5, a column 9, a four-station and two lifting devices 10, and the center rod 5 Supported on the support beam 1, the upper tray 3 and the lower tray 4 are coaxially disposed, and each of the stations includes an upper tray 3, a lower tray 4 and a locking rod 2, and the upper tray 3 and the upper chuck are configured together In the upper chuck assembly, the lower tray 4 and the lower chuck together form a lower chuck assembly, and the tire is clamped between the upper and lower chucks when the mold is set.

Two stations are disposed on the left and right sides of the column 9, and two stations on the same side of the column 9 are disposed on the upper and lower sides of the support beam 1 and share the support beam 1. Each of the left and right sides of the column 9 is provided with a lifting device 10, the lifting device 10 is disposed under two stations on the same side thereof, and the lifting device 10 passes through the engaging structure and the adjacent station. The tray 4 constitutes a detachable connection. The lower end of the lower tray 4 is a cylindrical boss, and the outer circular surface of the boss is provided with an annular groove having a semicircular cross section, and the upper end of the lifting device 10 is opened with the outer diameter of the boss a matching counterbore, and the upper end of the lifting device 10 is provided with a pin hole corresponding to the position of the groove, and the engaging structure comprises a groove, a pin hole and a cylindrical shape inserted in the pin hole and the groove The bolt is constructed. With the above structure, the stroke of the lifting device is larger than the stroke required for the lower tray, and the extra stroke is used to realize the pre-compression function before inflation.

An upturn driving mechanism is disposed on each of the left and right sides of the vertical rod 9. The inverting drive mechanism includes a driving cylinder and a meshing gear and a rack, and the rack is fixed to an output shaft of the driving cylinder, the gear a fixed connection with the support beam 1 to form a drive connection between the inversion drive mechanism on each side and the support beam 1 on the same side, the support beam 1 having a rotational movement about its own axis by the drive of the inversion drive mechanism . The above drive mechanism is not limited to the use of a drive cylinder as a power source, and a hydraulic cylinder or the like can also be used. The drive system is also not limited to gear and rack meshing. Chain drive or belt drive is also available. However, any combination of structures that can be employed by those skilled in the art without the creation may fall within the scope of the present invention.

In the embodiment, a 0-type sealing ring is provided between the upper tray and the lock lever, between the upper chuck and the upper tray, and between the lower tray and the lower chuck to prevent air leakage during the tire shaping process, resulting in failure of the setting.

As shown in Fig. 1, the two stations on the same side of the column share one of the center rods 5, i.e., the four-seat rear tire inflation setting device includes two center rods 5.

As shown in FIG. 3, for each station, the upper tray 3 is sleeved on the locking rod 2, and the upper end of the upper tray 3 is fixed to the supporting beam 1, during the operation of the rear inflating device, It is stated that the tray 3 is stationary.

As shown in FIG. 3 and FIG. 9 , the center rod 5 is provided with a joint end 50 and a positioning end 5 1 , and a positioning hole is formed on the support beam 1 corresponding to the center rod 5 , and the center rod is positioned. The end 51 passes through the positioning hole and is supported by the positioning mechanism 52. The center rod 5 is drivingly coupled to a drive mechanism 7 on the support beam. Preferably, the positioning mechanism 52 is a Hough structure, which is fixed by two symmetrical bearing bushes. The positioning end 51 of the center bar is provided with a step, and an end surface of the step is supported by the positioning mechanism 52. At one end, the other end of the positioning mechanism 52 is pressed against the support beam 1.

The non-latching head end of the locking rod 2 is provided with an axial threaded hole, the coupling end 50 is provided with an external thread, and the locking rod 2 is screwed between the threaded hole and the coupling end 50 and the center rod 5 The helical transmission is formed, and the locking lever 2 has a reciprocating motion in the axial direction by the rotation of the center rod 5 and the screw transmission.

A copper sleeve is disposed between the upper end of the locking rod 2 and the center rod 5, so that the cooperation between the two is compact, and the locking rod is prevented from shaking during the movement.

As shown in FIG. 5, the driving mechanism 7 includes a reduction motor 70, a worm wheel 71 and a worm 72. The reduction motor 70 is fixed on the support beam 1, and the worm 72 is fixedly connected to the output shaft of the reduction motor 70. The worm wheel 7 1 is fixedly connected to the positioning end 5 1 of the center rod. The output shaft of the motor 70 drives the center rod 5 to rotate about its own axis by the meshing transmission between the worm wheel and the worm.

As shown in FIG. 3 and FIG. 5, the rear inflator further includes a latching operating mechanism 6 including a latching gear 60, a latching gear shaft 61 and a wrench 62 fixedly coupled to the latching gear shaft, the latching The gear 60 is fixedly connected to the upper end of the locking rod 2, and the locking gear shaft 61 supported on the supporting beam 1 about its own axis is disposed in parallel on the side of the locking rod 2, the locking rod 2 The engagement drive between the latching gear and the latching gear shaft has a rotation about the axis of the latching lever.

The above-mentioned locking lever and the lower tray are connected by a wrong tooth structure, that is, when the teeth are dislocated, the two are separated, and when the teeth are combined, the two are combined. There are 6 plum teeth on the locking rod and the lower tray. The locking gear is rotated by rotating a wrench fixedly coupled to the locking gear shaft, thereby rotating the locking gear and the locking lever together by a certain angle, so that the teeth disposed on the locking lever and the lower tray are staggered or opposed. At the same time, the locking lever can be locked or unlocked by only rotating 30 °, so the locking gear can be selected as a non-round gear. Preferably, the central angle of the locking gear is 60 °, that is, the locking gear is only 1 / 6 Round. In the present embodiment, the number of the plum blossom teeth on the lock lever 2 and the lower tray 4 is not limited to six, and may be four or eight.

As shown in FIG. 4, FIG. 6 to FIG. 8, FIG. 12 and FIG. 13, the rear inflator further includes an anti-rotation rod 8, the upper end of the locking rod 2 is provided with an annular groove 20, and the lower end of the locking rod 2 is The latching end is provided with six first latching teeth 21, and the upper end of the lower tray 4 is provided with an equal amount of second latching teeth 40 forming a wrong tooth structure with the first latching teeth, and the upper tray 3 is provided with The anti-rotation hole 30 is parallel to the axis of the locking rod 2, and one end of the anti-rotation rod 8 is fitted in the annular groove 20 by a protrusion provided at the end, and the other end of the anti-rotation rod 8 is simultaneously The inner tray is inserted into the groove between the anti-rotation hole 30 and the two second locking teeth 40 to prevent the lower tray from falling off due to accidental rotation. As shown in Fig. 4, the lower end surface of the anti-rotation lever 8 is higher than the upper end surface of any of the first lock teeth 21 to prevent the anti-rotation lever from interfering with the lock lever.

(1) Determine the rim width according to the specifications of the tire to be set;

(2) Start the motor of the drive mechanism, rotate the center rod around its own axis under the drive of the gear drive, and move the lock lever axially through the screw drive between the center rod and the lock lever until the lock head of the lock lever reaches the rim The position required for the width;

(3) The driving device drives the air intake of the lifting device to raise the lifting device to the lower tray, and uses the engaging structure to combine the lifting device with the lower tray;

(4) Rotate the wrench of the lockout control mechanism to make it rotate 30°, so that the teeth and slots respectively set on the lock lever and the lower tray are opposite to realize the loose lock;

(6) Starting the tire conveyor and transporting the tire to be coaxial with the upper and lower chuck assemblies;

(7) The lifting device drives the cylinder air intake, and the lifting device drives the lower chuck assembly and the tire to rise until the distance between the lower chuck and the upper chuck is reduced by the rim width. Go to preload stroke;

(10) The lower chuck assembly is slowly moved down by the lifted tire until the teeth on the lower tray bear against the teeth on the lock lever to the desired position of the rim width;

( 13) The tire of this station enters the pressure holding and setting state.

Embodiment 2: The structure of the embodiment is basically the same as that of the first embodiment. The difference is that, as shown in FIG. 14, the driving mechanism 7 is a chain transmission, and includes a motor 73, a chain 74, and a driving sprocket engaged with the chain 74. 75 and the driven sprocket 76, the motor 73 is fixed on the support beam 1, the drive sprocket 75 is fixed on the output shaft of the motor 73, and the driven sprocket 76 is fixed to the center rod Positioning end 51.

Claims

A rear tire inflation device comprising a support beam (1), a lock lever (2), a coaxially disposed upper tray (3) and a lower tray (4), the upper tray (3) being sleeved on the lock The rod (2) is characterized in that: the upper end of the upper tray (3) is fixed to the support beam (1);

The rear inflator further includes a center rod (5) supported on the support beam (1) for rotation about its own axis, and the center rod (5) is provided with a joint end (50) and a positioning end (51). The non-latching head end of the locking lever (2) is provided with an axial threaded hole, the coupling end (50) is provided with an external thread, and the locking rod (2) is used between the threaded hole and the coupling end (50) The screwing and the center rod (5) constitute a screw transmission, and the locking rod (2) has an axial reciprocating motion by the rotation of the center rod (5) and the screw transmission.

2. The rear inflator of claim 1, wherein: the rear inflator further comprises a latching operating mechanism (6), the latching operating mechanism comprising a latching gear (60), a latching gear shaft (61), and a locking wrench (62) fixedly coupled to the locking gear shaft, the locking gear (60) being fixedly coupled to the locking rod (2), supported by the locking gear shaft on the supporting beam (1) rotating about its own axis (61) Parallelly disposed on a side of the lock lever (2), the lock lever (2) has a rotation about an axis of the lock lever by an engagement transmission between the lock gear and the lock gear shaft.

3. The rear airing device according to claim 1, wherein: a positioning hole is formed on the support beam (1) corresponding to the center rod (5), and the positioning end of the center rod (51) Passing through the positioning hole and being supported on the support beam (1) by a positioning mechanism (52), the central rod (5) is drivingly connected with a driving mechanism (7), and the central rod (5) passes through the driving mechanism The drive of (7) has a rotation about its own axis.

4. The rear airing device according to claim 3, wherein: the positioning mechanism (52) is a Haf structure, which is fixed by two symmetrical bearing pads, and the positioning end of the center rod (51) a step is provided, one end of the step is supported at one end of the positioning mechanism (52), and the other end of the positioning mechanism (52) is pressed against the support beam (1) Upper.

5. The rear airing device according to claim 3, wherein: the driving mechanism (7) comprises a geared motor (70), a worm wheel (71) and a worm (72), and the geared motor (70) is fixed to On the support beam (1), the worm (72) is fixedly connected to the output shaft of the reduction motor (70), and the worm wheel (71) is fixedly connected to the positioning end (51) of the center rod.

6. The rear airing device according to claim 3, wherein: the driving mechanism (7) comprises a reduction motor (73), a chain (74), and a driving sprocket (75) meshing with the chain (74). And the driven sprocket (76), the reduction motor (73) is fixed on the support beam (1), and the drive sprocket (75) is fixed on the output shaft of the reduction motor (73), the slave The moving sprocket (76) is fixed to the positioning end (51) of the center rod.

The rear inflation device according to claim 1, wherein the rear inflation device further comprises an anti-rotation rod (8), and an upper end of the locking rod (2) is provided with an annular groove (20), and the The latching end of the lower end of the locking lever (2) is provided with at least two first latching teeth (21), and the upper end of the lower tray (4) is provided with an equal amount of a wrong tooth structure with the first latching tooth (21) a second locking tooth (40), the upper tray (3) is provided with an anti-rotation hole (30) whose axis is parallel to the axis of the locking rod (2), and one end of the anti-rotation rod (8) is disposed at the end a convex card is mounted in the annular groove (20), and the other end of the anti-rotation rod (8) is simultaneously inserted into the anti-rotation hole (30) and two of the second locking teeth

(40) Between the slots.

8. The rear inflatable device according to claim 1, wherein: the rear inflatable device comprises a column (9), a four-station and two lifting devices (10), each of the stations comprising an upper tray ( 3), the lower tray (4) and a locking rod (2), two legs are arranged on the left and right sides of the column (9), and two stations on the same side of the column (9) are respectively arranged on the support The support beam (1) is shared by the upper and lower sides of the beam (1), and the lifting device (10) is disposed on each of the left and right sides of the column (9), and the lifting device (10) is disposed on the same side thereof Below the two stations, the lifting device (10) is detachably connected to the lower tray of the adjacent station by the engaging structure.

9. The rear airing device according to claim 8, characterized in that: the two stations on the same side of the column (9) share one of the center rods (5).

10. The rear airing device according to claim 7, wherein: the lower end surface of the anti-rotation lever (8) is higher than the lower end surface of any of the first locking teeth (21).