Pneumatic motor with air brake structure

Abstract

The application discloses a pneumatic motor with air brake structure, wherein the air brake cylinder part is connected to the cylinder part far from the cover plate part, the inner wall of the bottom of the air brake cylinder part is provided with a plurality of brake disc cavities, the piston rod part is provided corresponding to the brake disc cavities and is slidably arranged in the brake disc cavities, the elastic member is arranged between the piston rod part and the brake disc cavities and is in a compressed state, the brake disc is connected to the free end of the piston rod part near the rotating shaft and is arranged to be separable from the rotating shaft, the air brake pipeline is led from the outer wall of the air brake cylinder part to the bottom of the brake disc cavity, and the piston rod part overcomes the elastic force of the elastic member when the air brake pipeline is ventilated. The pneumatic motor with air brake structure provided by the application increases the number of brake disc cavities, so that the number of piston rod parts is also increased, the size of the piston rod part is reduced, the driving force required for driving the piston rod part is reduced, the brake stopping force is maintained, and the piston rod parts can be redundantly arranged, so that the brake stopping effect can be achieved when a single piston rod part is problematic.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air motor structure, in particular to an air motor with air brake structure. BACKGROUND

[0002] The structure of air motor is diverse, mainly including vane type and piston type, wherein the structure of vane type is relatively simple and has the widest application. The air motor has the characteristics of small volume, high power, high adaptability, quick start, stepless speed regulation, simple structure, long service life, no influence from external environment, safety and explosion prevention. The air motor sometimes is configured with stop structure to further improve the stopping speed of the air motor and provide braking effect. The selection of stop structure includes electromagnetic type and air type, and the air type stop structure is relatively complex and has poor flexibility, and the stop function is lost after abnormality.

[0003] As in China CN200946609Y, the fixed seat has a recess, the recess has an air inlet hole leading to the gas pipeline outside the circumference of the fixed seat, the fixed seat and the air motor shell have a plurality of supporting and fixing columns, the fixed seat has a distance from the shell with the length of the column, and the brake pad is located in the supporting distance of the column; the disc brake mechanism includes a disc brake drum, a piston and an elastic element, the disc brake drum is located in the space supported by the column, the disc brake drum has a limiting groove at the position of the column, the disc brake drum disc surface is directed to the direction of the brake pad, the disc brake drum back surface is abutted by the elastic element, the disc brake drum is penetrated in the recess of the fixed seat, and the piston is fixedly connected with the other side of the fixed seat, and the piston and the recess of the fixed seat have a gas chamber. SUMMARY

[0004] The main purpose of the present application is to provide an air motor with air brake structure, which aims to solve the problem that the air type stop structure of the current air motor has high complexity, poor reaction flexibility of stop action, and stop function is lost after abnormality.

[0005] In order to achieve the above purpose, the present application provides an air motor with air brake structure, which comprises:

[0006] The cylinder barrel part comprises an outer cylinder part and an inner cylinder part arranged in the outer cylinder part, a rotor barrel cavity is penetrated in the middle shaft of the inner cylinder part, the rotor barrel cavity is eccentrically arranged with the outer cylinder part, and the first gas channel and the second gas channel are penetrated in the length direction of the inner cylinder part;

[0007] The first gas port is arranged on the outer wall of the cylinder barrel part and connected to the first gas channel;

[0008] The second gas port is arranged on the outer wall of the cylinder barrel part and connected to the second gas channel;

[0009] A rotor assembly, comprising a rotor cylinder, a rotating shaft and a plurality of blades, the rotor cylinder is rotatably arranged in the rotor cylinder cavity, the rotor cylinder is coaxially arranged with the outer cylinder part, a plurality of blade grooves are arranged on the outer wall of the rotor cylinder along the height direction, the extension direction of the blade grooves on the rotor cylinder cross section passes through the central axis of the rotor cylinder, the blades are slidably arranged in the blade grooves, wherein, when the rotor cylinder rotates, the blades cooperate with the inner circumferential wall of the rotor cylinder cavity;

[0010] A cover plate part is connected to the cylinder part to enclose the rotor assembly.

[0011] A brake cylinder part is connected to the cylinder part away from the cover plate part, a plurality of brake cavities are arranged on the inner wall of the bottom of the brake cylinder part.

[0012] A plurality of piston rod parts are arranged corresponding to the brake cavities and slidably arranged in the brake cavities.

[0013] A plurality of elastic members are arranged between the piston rod parts and the brake cavities and are in a compressed state.

[0014] Brake pads are connected to the free ends of the piston rod parts near the rotating shaft and are arranged to be separable from the rotating shaft.

[0015] A brake pipe is connected from the outer wall of the brake cylinder part to the bottom of the brake cavity, when the brake pipe is ventilated, the piston rod parts overcome the elastic force of the elastic members.

[0016] Further, the piston rod part comprises a piston part and a rod part connected to each other, a limiting ring is arranged on the inner wall of the brake cavity, the piston part is arranged at the bottom of the brake cavity, the rod part passes through the limiting ring and is connected to the brake pad, and the elastic member is arranged between the limiting ring and the piston part.

[0017] Further, the piston rod part comprises a piston part and a rod part connected in sequence, the piston part is arranged at the bottom of the brake cavity, the elastic member is arranged between the piston part and the bottom of the brake cavity, and the brake pipe is connected from the brake cavity and then connected to the outside of the air motor.

[0018] Further, the brake pipe is connected from the brake cavity and then connected to the first air port.

[0019] Further, the extension direction of the blade grooves on the rotor cylinder cross section passes through the central axis of the rotor cylinder, and the rotor assembly further comprises a plurality of spring pins, a plurality of the blades are arranged in pairs in the radial direction of the rotor cylinder, and each pair of the blades is connected by the spring pin passing through the rotating shaft.

[0020] Further, the spring pin is in compression when it passes through the center of the rotor cylinder cavity.

[0021] Further, the thickness dimension of the vane exceeds the thickness dimension of the vane slot.

[0022] Further, each pair of vanes is connected by two spring pins.

[0023] Further, the free end of the vane near the inner wall of the cylinder portion in the width direction of the vane includes first and second radially symmetric arcuate regions in the thickness direction, wherein the first radially symmetric arcuate region gradually increases in curvature radius from outside to inside in the thickness direction of the vane.

[0024] Further, the cylinder portion is provided with a first cover plate at the free end in the length direction of the rotor assembly, and the cover portion is provided with a second cover plate at the free end in the length direction of the rotor assembly.

[0025] The pneumatic motor with the air brake structure provided by the application increases the number of brake cavities, and the number of piston rod portions is also increased, the size of the piston rod portion is reduced, the driving force required for driving the piston rod portion is reduced, and the braking force is maintained; the piston rod portions can form redundant settings, and the braking effect can be achieved when a single piston rod portion fails. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a three-dimensional schematic view of the first embodiment of the pneumatic motor with the air brake structure of the application;

[0027] Figure 2 is a three-dimensional schematic view of the first embodiment of the pneumatic motor with the air brake structure of the application (part of the cover plate portion is hidden);

[0028] Figure 3 is a three-dimensional schematic view of the first embodiment of the pneumatic motor with the air brake structure of the application (the cover plate portion is hidden);

[0029] Figure 4 is a longitudinal sectional view of the first embodiment of the pneumatic motor with the air brake structure of the application (at the central axis);

[0030] Figure 5 is a longitudinal sectional view of the first embodiment of the pneumatic motor with the air brake structure of the application (at the second air port);

[0031] Figure 6 is a longitudinal sectional view of the second embodiment of the pneumatic motor with the air brake structure of the application (parallel to the first air channel and the second air channel);

[0032] Figure 7 Fig. 7 is a longitudinal sectional view (parallel to the first air passage and the second air passage) of a pneumatic motor with air brake structure of the third embodiment of the present application;

[0033] Figure 8 Fig. 8 is a schematic view of the rotor cylinder and the vane in the inner cylinder portion of the pneumatic motor with air brake structure of the fourth embodiment of the present application;

[0034] Figure 9 Fig. 9 is a schematic view of the pair of vanes in the inner cylinder portion of the pneumatic motor with air brake structure of the fourth embodiment of the present application;

[0035] Figure 10 Fig. 10 is a schematic view of the rotor cylinder and the vane combined of the pneumatic motor with air brake structure of the fourth embodiment of the present application;

[0036] Figure 11 Fig. 11 is a schematic view of the connection of the vane and the spring pin of the pneumatic motor with air brake structure of the fourth embodiment of the present application;

[0037] Figure 12 Fig. 12 is a schematic view of the matching of the vane and the inner wall of the rotor cylinder cavity of the pneumatic motor with air brake structure of the fourth embodiment of the present application;

[0038] Figure 13 Fig. 13 is an enlarged view of A of Fig. 12; Figure 12

[0039] Figure 14 Fig. 14 is an enlarged view of B of Fig. 12. Figure 12

[0040] The implementation, functional features and advantages of the present application will be further explained with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein merely exemplify the application and do not limit the application.

[0042] ​​It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It is further understood that the terms "comprise" and "comprising" and the like, when used in the specification, do not exclude the presence of other elements or steps than those listed. It is further understood that the term "including" as used herein, means "comprising" in the sense that "comprising" is used in a broadest sense in connection with elucidation of the application. It is further understood that the term "coupled" as used herein, if not defined elsewhere, means that the coupled items are directly connected to or in contact with each other, or are indirectly connected or in contact with each other through one or more intermediate items. It is further understood that the term "connected" as used herein, if not defined elsewhere, means that the connected items are either directly connected to or in contact with each other, or are indirectly connected or in contact with each other through one or more intermediate items. It is further understood that the term "coupled" as used herein, if not defined elsewhere, includes a wireless connection or a wireless coupling. It is further understood that the term "and / or" as used herein, if not defined elsewhere, includes any and all combinations of one or more of the associated listed items.

[0043] It is to be understood that the terms so used are intended to encompass common and dictionary definitions of terms as well as the special definitions as understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in a dictionary, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0044] Reference Figures 1 to 14 In one embodiment of the present application, a pneumatic motor with air brake structure comprises:

[0045] The cylinder barrel part 100 comprises an outer barrel part 110 and an inner barrel part 120 arranged in the outer barrel part 110, a rotor barrel cavity 130 is penetrated through the inner barrel part 120 at the axis, the rotor barrel cavity 130 is arranged eccentrically with the outer barrel part 110, and a first air passage 140 and a second air passage 150 are penetrated through the inner barrel part 120 in the length direction;

[0046] The first air port 200 is arranged on the outer wall of the cylinder barrel part 100 and is communicated to the first air passage 140;

[0047] The second air port 300 is arranged on the outer wall of the cylinder barrel part 100 and is communicated to the second air passage 150;

[0048] The rotor assembly 400 comprises a rotor cylinder 410, a rotating shaft 420 and a plurality of blades 430, the rotor cylinder 410 is rotatably arranged in the rotor cylinder cavity 130, the rotor cylinder 410 is coaxially arranged with the outer cylinder part 110, a plurality of blade grooves 411 extending along the height direction are arranged on the outer wall of the rotor cylinder 410, the extending direction of the blade grooves 411 on the circumferential interface of the rotor cylinder 410 passes through the central axis of the rotor cylinder 410, the blades 430 are slidably arranged in the blade grooves 411, and when the rotor cylinder 410 rotates, the blades 430 cooperate with the inner circumferential wall of the rotor cylinder cavity 130.

[0049] The cover plate part 500 is connected to the cylinder part 100 to enclose the rotor assembly 400.

[0050] The air brake cylinder part 600 is connected to the end of the cylinder part 100 away from the cover plate part 500, and a plurality of brake pad cavities 610 are arranged on the inner wall of the bottom of the air brake cylinder part 600.

[0051] A plurality of piston rod parts 700 are arranged corresponding to the brake pad cavities 610 and are slidably arranged in the brake pad cavities 610.

[0052] A plurality of elastic members 800 are arranged between the piston rod parts 700 and the brake pad cavities 610 and are in a compressed state.

[0053] The brake pad 900 is connected to the free end of the plurality of piston rod parts 700 near the rotating shaft 420 and is arranged to be separable from the rotating shaft 420.

[0054] The air brake pipe 620 is connected from the outer wall of the air brake cylinder part 600 to the bottom of the brake pad cavity 610, and when the air brake pipe 620 is ventilated, the piston rod parts 700 overcome the elastic force of the elastic members 800.

[0055] In the prior art, the selection of the brake structure includes electromagnetic and pneumatic types, and the current pneumatic brake structure is relatively complex and has poor flexibility, and the brake function is lost when an abnormality occurs.

[0056] In the present application, the cylinder barrel part 100, the first air port 200, the second air port 300, the rotor assembly 400 and the cover plate part 500 form the main working structure, and the rotor assembly 400 is rotatably fixed in the cylinder barrel part 100 and the cover plate part 500. The cylinder barrel part 100 comprises an outer barrel part 110 and an inner barrel part 120 arranged in the outer barrel part 110, and the outer barrel part 110 and the inner barrel part 120 can be an integral structure or a split structure. A rotor barrel cavity 130 is penetrated through the middle axis of the inner barrel part 120, and the rotor barrel cavity 130 is arranged eccentrically with the outer barrel part 110. A first air channel 140 and a second air channel 150 are penetrated through the length direction of the inner barrel part 120. The first air port 200 is arranged on the outer wall of the cylinder barrel part 100 and is communicated to the first air channel 140. The second air port 300 is arranged on the outer wall of the cylinder barrel part 100 and is communicated to the second air channel 150. In the working process, the first air channel 140, the second air channel 150 and the rotor barrel cavity 130 form an air path, and when the air path is ventilated, the airflow drives the rotor assembly 400 to rotate. The rotor assembly 400 comprises a rotor cylinder 410, a rotating shaft 420 and a plurality of blades 430. The rotor cylinder 410 is rotatably arranged in the rotor barrel cavity 130, and the rotor cylinder 410 is coaxially arranged with the outer barrel part 110. A plurality of blade grooves 411 extending along the height direction are arranged on the outer wall of the rotor cylinder 410. The extending direction of the blade grooves 411 on the circular interface of the rotor cylinder 410 penetrates through the middle axis of the rotor cylinder 410. The blades 430 are slidably arranged in the blade grooves 411. When the rotor cylinder 410 rotates, when the gap between the rotor cylinder 410 and the inner wall of the rotor barrel cavity 130 increases, the blades 430 are thrown out and cooperated with the inner circumferential wall of the rotor barrel cavity 130. When the gap between the rotor cylinder 410 and the inner wall of the rotor barrel cavity 130 decreases, the blades 430 are pressed into the blade grooves 411 by the inner circumferential wall of the rotor barrel cavity 130. All the above structures complete the function of the blade type pneumatic motor.

[0057] The air brake cylinder part 600 is connected to the end of the cylinder barrel part 100 away from the cover plate part 500, and the air brake cylinder part 600 and the cylinder barrel part 100 form an air brake working cavity. The rotating shaft 420 penetrates through the cylinder barrel part 100 and extends into the air brake working cavity. A plurality of brake pad cavities 610 are arranged on the inner wall of the bottom of the air brake cylinder part 600. A piston rod part 700 is arranged in the brake pad cavity 610. Brake pads 900 are connected to the free ends of the plurality of piston rod parts 700 close to the rotating shaft 420. A resilient member 800 is arranged corresponding to the piston rod part 700, and the resilient member 800 must be in a compressed state, that is, in function, but not limited to compressing the piston rod part 700 towards the rotating shaft 420 or separating from the rotating shaft 420. It should be noted that the rotating shaft 420 is not limited to a bar structure or an integral structure, and the rotating shaft 420 can further comprise a brake disc connected thereto.

[0058] The air brake pipe 620 is communicated from the outer wall of the air brake cylinder 600 to the bottom of the brake pad cavity 610. The air brake pipe 620 only needs to be communicated to the brake pad cavity 610 to function on the piston rod 700. However, it is not limited that the air brake pipe 620 functions to press the piston rod 700 towards the rotating shaft 420 or separate the piston rod 700 from the rotating shaft 420, that is, it is not limited that the air brake pipe 620 generates positive pressure or negative pressure in the brake pad cavity 610. When the air brake pipe 620 functions on the piston rod 700 by using positive pressure, the air brake pipe 620 is communicated from the outer wall of the air brake cylinder 600 to the bottom of the brake pad cavity 610, that is, a closed pipe, in this case, the function of the elastic member 800 is to separate the piston rod 700 from the rotating shaft 420. When the air brake pipe 620 functions on the piston rod 700 by using negative pressure, the air brake pipe 620 needs to be communicated out after being communicated from the outer wall of the air brake cylinder 600 to the brake pad cavity 610, at this time, when the air brake pipe 620 is ventilated, negative pressure is formed in the brake pad cavity 610, that is, the piston rod 700 is separated from the rotating shaft 420, in this case, the function of the elastic member 800 is to press the piston rod 700 towards the rotating shaft 420.

[0059] In summary, the number of brake pad cavities 610 is increased, and the number of piston rods 700 is also increased, the size of the piston rod 700 is reduced, and the driving force required to drive the piston rod 700 is reduced accordingly, but the braking force is maintained. In particular, the piston rods 700 can be redundantly arranged relative to each other, and the braking effect can still be achieved when a single piston rod 700 fails.

[0060] In one embodiment, the piston rod 700 includes a piston 710 and a rod 720 connected to each other, a limiting ring 611 is arranged on the inner wall of the brake pad cavity 610, the piston 710 is arranged at the bottom of the brake pad cavity 610, the rod 720 passes through the limiting ring 611 and is connected to the brake pad 900, and the elastic member 800 is arranged between the limiting ring 611 and the piston 710.

[0061] In this embodiment, the elastic member 800 functions to separate the piston rod 700 from the rotating shaft 420, that is, the brake pad 900 is separated from the rotating shaft 420, when the air brake pipe 620 is not ventilated, the air motor can rotate normally, when the air brake pipe 620 is ventilated, the piston rod 700 slides under the action of positive pressure and overcomes the elastic force of the elastic member 800, the brake pad 900 contacts the rotating shaft 420, at this time, the air motor is in the braking state. The first air port 200, the second air port 300 and the air brake pipe 620 are all connected to the air pipe, and can all be supplied with positive pressure, so that the air motor can realize bidirectional rotation and air brake by communicating the positive pressure to the air brake pipe 620.

[0062] Reference Figure 6In one embodiment, the piston rod portion 700 comprises a piston portion 710 and a rod portion 720 connected in sequence, the piston portion 710 is arranged at the bottom of the brake pad cavity 610, the elastic member 800 is arranged between the piston portion 710 and the bottom of the brake pad cavity 610, and the air brake pipe 620 is led out from the brake pad cavity 610 and then led out to the outside of the air motor.

[0063] In the present embodiment, when the air brake pipe 620 is not aerated, the elastic member 800 causes the piston rod portion 700 to approach the rotating shaft 420, that is, the brake pad 900 approaches the rotating shaft 420, at this time the air motor is in the braking state; and since the air brake pipe 620 is led out from the brake pad cavity 610 and then led out to the outside of the air motor, when the air brake pipe 620 is aerated, a negative pressure is formed at the bottom of the brake pad cavity 610, which overcomes the elastic force of the elastic member 800, the piston rod portion 700 slides away from the rotating shaft 420, and the brake pad 900 separates from the rotating shaft 420. That is, in the present embodiment, only continuous aeration in the air brake pipe 620 can release the braking state, and when the air brake pipe 620 stops aerating, the braking state is entered. The above setting has obvious effect in safety protection and accurate driving, and the air motor cannot be braked due to problems in the air path connected to the air brake pipe 620, at this time only the air motor cannot be started.

[0064] Referring to FIG. 7, in one embodiment, the air brake pipe 620 is connected to the first air port 200 after being led out from the brake pad cavity 610.

[0065] In the present embodiment, a special operating structure is provided, the air brake pipe 620 is connected to the first air port 200 after being led out from the brake pad cavity 610, and the air brake pipe 620 is connected to the rotor cylinder cavity 130 through the first air passage 140, that is, the air brake pipe 620 participates in the air path for driving the rotation of the rotor assembly 400. The first air port 200 is closed, the second air port 300 and the air brake pipe 620 are connected to the air pipe, the second air port 300 is aerated and the air brake pipe 620 is aerated, the second air port 300 is aerated and the air brake pipe 620 is aerated, thereby realizing forward and reverse rotation. Since the air brake pipe 620 is led out from the brake pad cavity 610 and then led out to the outside of the air motor through the second air port 300, the setting that only continuous aeration in the air brake pipe 620 can release the braking state is realized, when the air flow does not drive the rotor assembly 400, the air brake pipe 620 is not aerated, the elastic member 800 causes the piston rod portion 700 to approach the rotating shaft 420, and the air motor is automatically in the braking state, thereby simplifying the operation and making the reaction more rapid.

[0066] Referring to Figures 8 to 14In one embodiment, the vane slots 411 extend through the center axis of the rotor cylinder 410, and the rotor assembly 400 further includes a plurality of spring pins 440, and a plurality of the vanes 430 are arranged in pairs in the radial direction of the rotor cylinder 410, and each pair of the vanes 430 is connected by the spring pin 440 passing through the rotor shaft 420.

[0067] In the foregoing embodiment, the direction of the blade slot 411 on the circular cross section of the rotor cylinder 410 is not limited, and specifically the blade 430 can slide in the blade slot 411, that is, when the rotor cylinder 410 rotates, the blade 430 forms a sealing fit with the inner peripheral wall of the rotor cylinder cavity 130. In the prior art, the blade 430 is drawn out of the blade slot 411 under the action of centrifugal force (which is difficult to achieve at low speed), and is drawn into the blade slot 411 under the action of the pressure of the rotor cylinder 410, thereby achieving sliding in the blade slot 411, and there is impact between the blade 430 and the blade slot 411, and there is also impact between the blade 430 and the inner cylinder portion 120, which all produce noise; in particular, in order to achieve the sliding of the blade 430, the blade 430 and the blade slot 411 are gap-fitted in the thickness direction, and the above gap fit is also a source of noise. In the present embodiment, in order to reduce the noise of the air motor and the reliability of operation, the blade 430 is structurally provided. First, the eccentricity size of the rotor cylinder cavity 130 and the outer cylinder portion 110 is not particularly large, and when the rotor cylinder cavity 130 rotates, the distance between the pair of two blades 430 only has a small change, and the change is offset by the deformation of the spring pin 440, so that the two blades 430 are connected by the spring pin 440, but the rotor assembly 400 can still rotate normally. The blade 430 is always in contact with the inner wall of the inner cylinder portion 120 by the action of the spring pin 440, so that the impact noise of the blade 430 is basically eliminated. In addition to solving the problem of impact noise, at low speed, the blade 430 can still be in contact with the inner wall of the inner cylinder portion 120 by the action of the spring pin 440, which guarantees the use performance. In particular, due to the direct action of the spring pin 440, the blade 430 is no longer a problem when it is drawn out or drawn into the blade slot, the blade 430 can be clamped in the blade slot 411, and the vibration of the blade 430 is greatly suppressed, so that the noise is further weakened. The spring pin 440 is arranged between the two blades 430, and the specific connection mode of the spring pin 440 can also be various; the spring pin 440 can be screwed to the blade 430, at which time the connection strength is high, or a first fixing hole is arranged on the blade 430, and the spring pin 440 is clamped in the first fixing hole (an interference fit can also be formed), so that the installation difficulty and structural complexity of the blade assembly are reduced. The spring pin 440 has strength while providing elastic deformation in the length direction, the elastic force of the spring pin 440 presses the blade 430 towards the inner wall of the cylinder portion 100, increases the sealing effect, and makes the rotor assembly 400 be better driven. In order to comprehensively improve the sealing effect and reduce wear, the elastic force provided by the spring pin can be adjusted according to actual application.

[0068] In one embodiment, the spring pin 440 is in a compressed state when it passes through the center of the rotor cylinder cavity 130.

[0069] In the present embodiment, the spring pin 440 passes through the center of the rotor cylinder cavity 130, which is the maximum length, and if it is in a compressed state at this time, it is always in a compressed state, which is advantageous for the sealing effect between the vane 430 and the inner wall of the cylinder portion 100.

[0070] In one embodiment, the thickness dimension of the vane 430 is larger than the thickness dimension of the vane groove 411.

[0071] In the present embodiment, the thickness dimension of the vane 430 is larger than the thickness dimension of the vane groove 411, so that the vane 430 is clamped by the vane groove 411, and the possibility of vibration is reduced. Of course, the thickness dimension of the vane 430 needs to be selected through experiments to meet the smooth sliding while reducing noise.

[0072] Referring to Figure 11 In one embodiment, each pair of vanes 430 is connected by two spring pins 440.

[0073] In the present embodiment, the two vanes 430 and the two spring pins 440 form a structure with improved stability by being arranged as a whole, and when the number of spring pins 440 is too large, it increases the difficulty of space arrangement.

[0074] Referring to Figures 12 to 14 In one embodiment, the free end of the vane 430 near the inner wall of the cylinder portion 100 in the width direction includes a first curvature region 431 and a second curvature region 432 connected and symmetrical in the thickness direction, and the curvature radius of the first curvature region 431 gradually increases from outside to inside in the thickness direction of the vane 430.

[0075] In the embodiment, the increasing trend of the radius of curvature of the first arc region 431 corresponds to the eccentricity between the rotor cylinder 410 and the rotor cylinder cavity 130, and the first arc region 431 and the second arc region 432 are arranged to keep the blade 430 tangent to the inner wall of the rotor cylinder cavity 130 regardless of the specific position of the rotor assembly 400, thereby improving the sealing performance and reducing the noise. When the blade 430 is located at the position with the smallest distance between the rotor cylinder 410 and the rotor cylinder cavity 130, the radius of curvature of the first arc region 431 is the distance between the rotor cylinder 410 and the rotor cylinder cavity 130, thereby ensuring that the first arc region 431 of the blade 430 is tangent to the inner wall of the rotor cylinder cavity 130. When the blade 430 is located at the position with the largest distance between the rotor cylinder 410 and the rotor cylinder cavity 130, the radius of curvature of the first arc region 431 is the distance between the rotor cylinder 410 and the rotor cylinder cavity 130, thereby ensuring that the first arc region 431 of the blade 430 is tangent to the inner wall of the rotor cylinder cavity 130. When the rotor assembly 400 continues to rotate, the second arc region 432 of the blade 430 contacts the inner wall of the rotor cylinder cavity 130, and the radius of curvature of the second arc region 432 changes in the same manner as the first arc region 431.

[0076] Referring to Figures 1 to 5 In one embodiment, the cylinder barrel portion 100 is provided with a first cover plate 160 at the free end in the length direction of the rotor assembly 400, and the cover plate portion 500 is provided with a second cover plate 510 at the free end in the length direction of the rotor assembly 400.

[0077] Since the cylinder barrel portion 100 and the cover plate portion 500 are in contact with the rotating rotor assembly 400, the lubrication effect between the interfaces is important. In the embodiment, the first cover plate 160 is separated from the main body of the cylinder barrel portion 100, so that the material and dimensional accuracy of the first cover plate 160 can be independently required to be strict. The second cover plate 510 is separated from the main body of the cover plate portion 500, so that the material and dimensional accuracy of the second cover plate 510 can be independently required to be strict. For example, the first cover plate 160 and the second cover plate 510 are made of polytetrafluoroethylene material, which has high strength, accurate size and strong positive effect of self-lubrication. The first cover plate 160 and the second cover plate 510 can be used as consumable replacement parts for maintenance.

[0078] As described above, the pneumatic motor with the air brake structure provided by the application increases the number of brake cavities 610, so that the number of piston rod portions 700 is also increased, the size of the piston rod portions 700 is reduced, the driving force required for driving the piston rod portions 700 is reduced, the braking force is maintained, the piston rod portions 700 can be redundantly arranged, and the braking effect can be achieved when a single piston rod portion 700 fails.

[0079] The above merely provides the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structure or equivalent flowchart transformation, or direct or indirect application in other related technical fields, which is made based on the contents of the present application specification and drawings, shall be included in the patent protection scope of the present application.

Claims

1. A pneumatic motor having an air brake structure, characterized by, The application relates to a pneumatic motor, comprising: a cylinder barrel part, comprising an outer barrel part and an inner barrel part arranged in the outer barrel part, a rotor barrel cavity is arranged through the middle axis of the inner barrel part, the rotor barrel cavity is arranged eccentrically with the outer barrel part, a first air channel and a second air channel are arranged through the length direction of the inner barrel part; a first air port is arranged on the outer wall of the cylinder barrel part and is connected to the first air channel; a second air port is arranged on the outer wall of the cylinder barrel part and is connected to the second air channel; a rotor assembly, comprising a rotor cylinder, a rotating shaft and a plurality of blades, the rotor cylinder is rotatably arranged in the rotor barrel cavity, the rotor cylinder is arranged concentrically with the outer barrel part, a plurality of blade grooves are arranged on the outer wall of the rotor cylinder and extend along the height direction of the rotor cylinder, the extending direction of the blade grooves on the rotor cylinder cross section passes through the middle axis of the rotor cylinder, the blades are slidably arranged in the blade grooves, when the rotor cylinder rotates, the blades are matched with the inner wall of the rotor barrel cavity; a cover plate part is connected to the cylinder barrel part and seals the rotor assembly; a pneumatic brake barrel part is connected to the cylinder barrel part and is away from the cover plate part, a plurality of brake cavities are arranged on the inner wall of the bottom of the pneumatic brake barrel part; a plurality of piston rod parts are arranged corresponding to the brake cavities and are slidably arranged in the brake cavities; a plurality of elastic members are arranged between the piston rod parts and the brake cavities and are in compression state; brakes are connected to the free ends of the piston rod parts near the rotating shaft and are arranged separately from the rotating shaft; a pneumatic brake pipeline is arranged from the outer wall of the pneumatic brake barrel part to the bottom of the brake cavity, when the pneumatic brake pipeline is ventilated, the piston rod parts overcome the elastic force of the elastic members; when the pneumatic brake pipeline acts on the piston rod parts by using positive pressure, the pneumatic brake pipeline is arranged from the outer wall of the pneumatic brake barrel part to the bottom of the brake cavity, the elastic members separate the piston rod parts from the rotating shaft; when the pneumatic brake pipeline acts on the piston rod parts by using negative pressure, the pneumatic brake pipeline is arranged from the outer wall of the pneumatic brake barrel part to the bottom of the brake cavity and is discharged, the elastic members press the piston rod parts to the rotating shaft.

2. The pneumatic motor having an air brake structure according to claim 1, characterized by, The piston rod parts comprise piston parts and rod parts which are connected to each other, a limiting ring is arranged on the inner wall of the brake cavity, the piston parts are arranged at the bottom of the brake cavity, the rod parts pass through the limiting ring and are connected to the brakes, the elastic members are arranged between the limiting ring and the piston parts.

3. The pneumatic motor having an air brake structure according to claim 1, wherein The piston rod parts comprise piston parts and rod parts which are sequentially connected, the piston parts are arranged at the bottom of the brake cavity, the elastic members are arranged between the piston parts and the bottom of the brake cavity, after the pneumatic brake pipeline is discharged from the brake cavity, the pneumatic brake pipeline is continuously discharged to outside of the pneumatic motor.

4. The pneumatic motor having an air brake structure according to claim 3, characterized by, The pneumatic brake pipeline is connected to the first air port after being discharged from the brake cavity.

5. The pneumatic motor having an air brake structure according to claim 1, wherein The extending direction of the blade grooves on the rotor cylinder cross section passes through the middle axis of the rotor cylinder, the rotor assembly further comprises a plurality of spring pins, a plurality of the blades are arranged in pairs in the radial direction of the rotor cylinder, each pair of the blades is connected through the spring pins which pass through the rotating shaft.

6. The pneumatic motor having an air brake structure according to claim 5, wherein The spring pins are in compression state when passing through the center of the rotor barrel cavity.

7. The pneumatic motor having an air brake structure according to claim 1, wherein The thickness dimension of the vane is larger than the thickness dimension of the vane groove.

8. The pneumatic motor having an air brake structure according to claim 5, wherein Each pair of the vanes is connected by two spring pins.

9. The pneumatic motor having an air brake structure according to claim 1, wherein The free end of the vane near the inner wall of the cylinder portion in the width direction of the vane includes a first curved region and a second curved region connected and symmetrical in the thickness direction, wherein the first curved region gradually increases in curvature radius from outside to inside in the thickness direction of the vane.

10. The pneumatic motor having an air brake structure according to claim 1, characterized by, The cylinder portion is provided with a first cover plate corresponding to the free end of the rotor assembly in the length direction, and the cover plate portion is provided with a second cover plate corresponding to the free end of the rotor assembly in the length direction.

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