CN219452576U - Bidirectional cylinder - Google Patents

Abstract

The utility model relates to the technical field of cylinders, in particular to a bidirectional cylinder, which comprises a cylinder body, a first pushing assembly and a second pushing assembly, wherein the first pushing assembly comprises a first cavity, a first piston push rod, a first air inlet and a first slide way opening, the second pushing assembly comprises a second cavity, a second piston push rod, a second air inlet and a second slide way opening, the first cavity and the second cavity are respectively arranged in the cylinder body, the first piston push rod is slidably arranged in the first cavity, the second piston push rod is movably arranged in the second cavity, one end of the first cavity is provided with a first slide way opening, the working end of the first piston push rod extends out of the first cavity from the first slide way opening, one end of the second cavity is provided with a second slide way opening, the working end of the second piston push rod extends out of the second cavity from the second slide way opening, the first air inlet is communicated with the first cavity, and the second air inlet is movably arranged in the second cavity.

Description

Bidirectional cylinder

Technical Field

The utility model relates to the technical field of air cylinders, in particular to a bidirectional air cylinder.

Background

The cylinder is a cylindrical metal part which guides the piston to perform linear reciprocating motion in the cylinder. The air converts thermal energy into mechanical energy by expansion in the engine cylinder; the gas is compressed by a piston in a compressor cylinder to raise the pressure.

The main classifications of cylinders are unidirectional cylinders and bidirectional cylinders. The piston push rod is arranged at only one end of the unidirectional cylinder, and can do reciprocating motion at only one end of the unidirectional cylinder. Piston push rods are respectively arranged at two ends in the cylinder body air cavity of the bidirectional cylinder, and the piston push rods at two ends can respectively reciprocate in opposite directions.

However, in the bidirectional cylinder in the prior art, as the piston push rods at two ends are provided with one cylinder body, when gas enters the air cavity of the cylinder body to push the piston push rods, the piston push rods at two ends are simultaneously pushed. For example: the technology of the Chinese patent application with the publication number of CN113833714A and the name of 'bidirectional telescopic cylinder', which is a technology of pushing two piston push rods by adopting a cylinder body air cavity, when pushing the piston push rods, the piston push rods at two ends are simultaneously pushed, and the piston push rods cannot be independently pushed respectively. In practical application occasions, the bidirectional telescopic cylinder can generate a plurality of inconveniences, and if the piston push rods at two ends need to independently stretch, the bidirectional telescopic cylinder adopting one cylinder body air cavity to push the two piston push rods cannot realize the function. And adopt single piston push rod in the two-way flexible cylinder in this application, if the piston push rod installs heavier work piece, then the piston push rod produces the deformation easily, leads to the fact the damage to the cylinder is whole easily.

Disclosure of Invention

In view of the above-mentioned drawbacks, the present utility model aims to provide a bidirectional cylinder, which provides cavities separately for two piston pushrods to move, and the movements of the two piston pushrods can be synchronous or asynchronous.

To achieve the purpose, the utility model adopts the following technical scheme:

a bidirectional cylinder comprises a cylinder body, a first pushing component and a second pushing component; the first pushing assembly comprises a first cavity, a first piston push rod, a first air inlet and a first slide way opening; the second pushing assembly comprises a second cavity, a second piston push rod, a second air inlet and a second slide way opening; the first cavity and the second cavity are respectively arranged in the cylinder body, the first piston push rod is slidably arranged in the first cavity, the second piston push rod is movably arranged in the second cavity, and the second piston push rod and the first piston push rod are parallel to each other and the working ends of the second piston push rod and the first piston push rod deviate from each other; one end of the first cavity is provided with the first slide way opening, the working end of the first piston push rod extends out of the first cavity from the first slide way opening, one end of the second cavity is provided with the second slide way opening, and the working end of the second piston push rod extends out of the second cavity from the second slide way opening; the first air inlet is communicated with the first cavity and is used for allowing air to flow into the first cavity so as to push the first piston push rod to move; the second air inlet is communicated with the second cavity, and the second air inlet is used for allowing air to flow into the second cavity so as to enable the air to push the second piston push rod to move.

Preferably, the first pushing component and the second pushing component are respectively provided with two groups; the working ends of the first piston push rods of the two groups of first pushing assemblies are connected, and the working ends of the second piston push rods of the two groups of second pushing assemblies are connected; the positions of the two groups of first pushing assemblies are respectively positioned at the left lower position and the right upper position of the longitudinal section of the cylinder body; the two groups of second pushing assemblies are respectively positioned at the right lower position and the left upper position of the longitudinal section of the cylinder body.

Preferably, the first air inlet comprises a first pushing air port and a first retracting air port, the first pushing air port and the first retracting air port are respectively positioned at two ends of the first cavity, and the first retracting air port is close to the working end of the first piston push rod.

Preferably, one end of the first piston push rod, which is away from the working end, is provided with a first sliding column, the diameter of the first sliding column is larger than that of the first piston push rod, the first sliding column is in sliding fit with the first cavity, and the peripheral surface of the first sliding column is provided with a first sealing ring.

Preferably, the first cavity is provided with a first bearing cylinder, the first bearing cylinder is detachably mounted at one end of the first cavity, which is used for the first piston push rod to extend out, the first slideway port penetrates through the first bearing cylinder, one end, close to the interior of the first cavity, of the first bearing cylinder is provided with a first retraction air gap, and the first retraction air port is communicated with the first retraction air gap; the other end of the first cavity is provided with a first plug block, the first plug block is detachably mounted with the first cavity, one end, close to the inside of the first cavity, of the first plug block is provided with a first propulsion air gap, and the first propulsion air port is communicated with the first propulsion air gap.

Preferably, the working ends of the two groups of first piston push rods are fixedly connected through a first mounting block.

Preferably, the second air inlet comprises a second pushing air port and a second retracting air port, the second pushing air port and the second retracting air port are respectively positioned at two ends of the second cavity, and the second retracting air port is positioned at one end of the second piston push rod extending out.

Preferably, one end of the second piston push rod, which is away from the working end, is provided with a second sliding column, the diameter of the second sliding column is larger than that of the second piston push rod, the second sliding column is in sliding fit with the second cavity, and the peripheral surface of the second sliding column is provided with a second sealing ring.

Preferably, the second cavity is provided with a second bearing cylinder, the second bearing cylinder is detachably mounted at one end of the second cavity, which is used for the second piston push rod to extend out, the second slideway port penetrates through the second bearing cylinder, one end, close to the interior of the second cavity, of the second bearing cylinder is provided with a second retraction air gap, and the second retraction air port is communicated with the second retraction air gap; the other end of the second cavity is provided with a second plug, one end of the second plug, which is close to the inside of the second cavity, is provided with a second propulsion air gap, and the second propulsion air port is communicated with the position of the second propulsion air gap.

Preferably, the working ends of the two groups of second piston push rods are fixedly connected through a second mounting block.

The technical scheme provided by the utility model can comprise the following beneficial effects: the first cavity and the second cavity are respectively and independently arranged in the cylinder body, the first piston push rod is slidably arranged in the first cavity, the second piston push rod is movably arranged in the second cavity, the first piston push rod and the second piston push rod can independently act, and the two piston push rods can synchronously or asynchronously act, so that the problem that the piston push rods of the bidirectional cylinder in the prior art can only act simultaneously is solved, and the bidirectional cylinder is convenient to use in practical occasions.

Drawings

FIG. 1 is a schematic view of a bi-directional cylinder according to the present utility model;

FIG. 2 is a schematic view of the interior of a bi-directional cylinder of FIG. 1;

fig. 3 is a schematic view of a longitudinal section of a bi-directional cylinder shown in fig. 1.

Wherein: 1-cylinder, 2-first cavity, 3-first piston push rod, 4-first air inlet, 5-second cavity, 6-second piston push rod, 7-second air inlet, 8-first bearing cylinder, 9-first retraction air gap, 10-first plug block, 11-first propulsion air gap, 12-first slide column, 13-first sealing ring, 14-first mounting block, 15-second bearing cylinder, 16-second retraction air gap, 17-second plug block, 18-second propulsion air gap, 19-second slide column, 20-second sealing ring, 21-second mounting block 21;

41-first push port, 42-first retract port, 71-second push port, 72-second retract port.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly, for distinguishing between the descriptive features, and not sequentially, and not lightly.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

A bidirectional cylinder according to an embodiment of the present utility model will be described with reference to fig. 1 to 3.

A bidirectional cylinder comprises a cylinder body 1, a first pushing component and a second pushing component; the first pushing assembly comprises a first cavity 2, a first piston push rod 3, a first air inlet 4 and a first slide way opening; the second pushing assembly comprises a second cavity 5, a second piston push rod 6, a second air inlet 7 and a second slide way opening; the first cavity 2 and the second cavity 5 are respectively arranged in the cylinder body 1, the first piston push rod 3 is arranged in the first cavity 2 in a sliding manner, the second piston push rod 6 is movably arranged in the second cavity 5, the second piston push rod 6 and the first piston push rod 3 are parallel to each other, and the working ends of the two are deviated; one end of the first cavity 2 is provided with a first slide way port, the working end of the first piston push rod 3 extends out of the first cavity 2 from the first slide way port, one end of the second cavity 5 is provided with a second slide way port, and the working end of the second piston push rod 6 extends out of the second cavity 5 from the second slide way port; the first air inlet 4 is communicated with the first cavity 2, and the first air inlet 4 is used for allowing air to flow into the first cavity 2 so that the air pushes the first piston push rod 3 to move; the second air inlet 7 is communicated with the second cavity 5, and the second air inlet 7 is used for allowing air to flow into the second cavity 5 so that the air pushes the second piston push rod 6 to move.

The bidirectional cylinder is used for feeding, pushing, stamping workpieces, clamping the workpieces and the like. Specifically, the cylinder body 1 of this embodiment is provided with first cavity 2 and second cavity 5 independently respectively, be provided with first piston push rod 3 and second piston push rod 6 respectively in first cavity 2 and second cavity 5, first piston push rod 3 and second piston push rod 6 are located independent cavity respectively, first piston push rod 3 and second piston push rod 6 can independent action, the action of two piston push rods can be synchronous or asynchronous, the piston push rod that has solved prior art two-way cylinder can only move the problem simultaneously, the convenience is used in the actual occasion.

The first slide way port is arranged at one end of the first cavity 2, and the first piston push rod 3 slides out of the first cavity 2 from the first slide way port, so that the first piston push rod 3 can conveniently act. The second slide way opening is arranged at one end of the second cavity 5, and the second piston push rod 6 slides out of the second cavity 5 from the second slide way opening, so that the second piston push rod 6 can conveniently act.

The first air inlet 4 is connected with an air pipe, so that air supplied by the air pipe is conveniently discharged into the first cavity 2 to push the first piston push rod 3 to move. The second air inlet 7 is connected with an air pipe, so that air supplied by the air pipe is conveniently discharged into the second cavity 5 to push the second piston push rod 6 to move.

Specifically, the first pushing component and the second pushing component are respectively provided with two groups; the working ends of the first piston push rods of the two groups of first pushing assemblies are connected, and the working ends of the second piston push rods of the two groups of second pushing assemblies are connected; the positions of the two groups of first pushing components are respectively positioned at the left lower position and the right upper position of the longitudinal section of the cylinder body 1; the positions of the two groups of second pushing components are respectively positioned at the right lower position and the left upper position of the longitudinal section of the cylinder body 1.

The first pushing component and the second pushing component are respectively provided with two groups, and the two groups are provided with two first piston push rods 3 and two second piston push rods 6, when the first piston push rods 3 or the second piston push rods 6 are connected with heavier pushing pieces, the two first piston push rods 3 or the two second piston push rods 6 can bear the gravity of the pushing pieces together, so that the working stability is ensured. When the two first piston push rods 3 or the two second piston push rods 6 are subjected to the gravity of the pushing piece together, the two first piston push rods are not easy to deform.

One first piston push rod 3 is located the second piston push rod 6 top of one, and another first piston push rod 3 is located the second piston push rod 6 below of another, makes things convenient for four cavitys compact setting in cylinder body 1, and when the volume of installation piece was great, the installation piece was connected to first piston push rod 3 or second piston push rod 6 of being convenient for.

Specifically, the first air inlet 4 includes a first thrust air port 41 and a first retraction air port 42, the first thrust air port 41 and the first retraction air port 42 are respectively located at two ends of the first cavity 2, and the first retraction air port 42 is close to the working end of the first piston push rod 3.

The first pushing air port 41 and the first retracting air port 42 are respectively provided with an air pipe, the first retracting air port 42 is close to the working end of the first piston push rod 3, when the first piston push rod 3 needs to be stretched, air is discharged into the first cavity 2 from the first pushing air port 41, the air pushes the first piston push rod 3 to slide out towards the first slide port, the first piston push rod 3 stretches outwards towards the first cavity 2, and the first piston push rod 3 stretches. When the first piston push rod 3 needs to retract, air is discharged into the first cavity 2 from the first retracting air port 42, the air pushes the first piston push rod 3 to move towards one end far away from the first slide port, the first piston push rod 3 moves towards the first cavity 2, and the first piston push rod 3 achieves retraction. The first pushing air port 41 and the first retracting air port 42 are respectively arranged at two ends of the first cavity 2, the first piston push rod 3 is pushed to move back and forth by using gas, the gas pushes the first piston push rod 3 to have larger pushing force, heavier devices or workpieces can be pushed, and the gas has good stability when pushing the first piston push rod 3, so that the first piston push rod 3 is convenient for pushing materials or workpieces.

Specifically, one end of the first piston push rod 3 facing away from the working end is provided with a first sliding column 12, the diameter of the first sliding column 12 is larger than that of the first piston push rod 3, the first sliding column 12 is in sliding fit with the first cavity 2, and the peripheral surface of the first sliding column 12 is provided with a first sealing ring 13. The diameter of the first sliding column 12 is larger than that of the first piston push rod 3, so that a gas storage space is formed between the first piston push rod 3 and the first cavity 2, and gas can push the first sliding column 12 in the gas storage space to drive the first piston push rod 3 to move. The first seal ring 13 can prevent gas from leaking from one end of the first slide column 12 to the other end when the first slide column 12 slides in the first cavity 2.

Specifically, the first cavity 2 is provided with a first bearing cylinder 8, the first bearing cylinder 8 is detachably mounted at one end of the first cavity 2, which is used for the first piston push rod 3 to extend out, a first slide way port penetrates through the first bearing cylinder 8, one end, close to the inside of the first cavity 2, of the first bearing cylinder 8 is provided with a first retraction air gap 9, and a first retraction air port 42 is communicated with the first retraction air gap 9; the other end of the first cavity 2 is provided with a first chock 10, the first chock 10 is detachably mounted with the first cavity 2, one end, close to the inside of the first cavity 2, of the first chock 10 is provided with a first propulsion air gap 11, and the first propulsion air port 41 is communicated with the first propulsion air gap 11.

The first retracting air gap 9 is disposed at one end of the first bearing cylinder 8 near the interior of the first cavity 2, and even if the first sliding column 12 is attached to the first bearing cylinder 8, the air still flows into the first cavity 2 from the first retracting air gap 9 to push the first sliding column 12 to move, and the first sliding column 12 drives the first piston push rod 3 to move.

The first pushing air gap 11 is disposed at one end of the first plug 10 near the first cavity 2, and even if the first sliding pillar 12 is attached to the first plug 10, the air still flows into the first cavity 2 from the first pushing air gap 11 to push the first sliding pillar 12 to move, and the first sliding pillar 12 drives the first piston push rod 3 to move.

One end of the first cavity 2 is provided with a first bearing cylinder 8, the other end of the first cavity 2 is provided with a first chock 10, the first bearing cylinder 8 and the first chock 10 are detachably mounted with the first cavity 2, and the first piston push rod 3 is convenient to mount or dismount in the first cavity 2, and the first piston push rod 3 is convenient to mount or maintain. The first bearing cylinder 8 and the first plug block 10 are in threaded fit with the first cavity 2, so that the installation is convenient.

Because the diameter of first slide post 12 is greater than the diameter of first piston push rod 3, and first slide post 12 is located the one end of first piston push rod 3, leads to the work end of first piston push rod 3 to produce the slope easily, is provided with first carrier 8 in the one end of first cavity 2, and first slide mouth sets up in the center of first carrier 8, and first carrier 8 can provide the supporting role for the work end of first piston push rod 3 obtains supporting, guarantees that the both ends of first piston push rod 3 are in the horizontality, makes things convenient for first piston push rod 3 to remove in first cavity 2.

Further, the working ends of the two sets of first piston pushrods 3 are fixedly connected by a first mounting block 14. The first piston push rod 3 can be connected with the pushing piece through the first mounting block 14, so that the pushing piece pushes against the material or the workpiece. Mounting holes may be provided in the first mounting block 14, through which bolts or screws pass to the pusher, facilitating a fixed mounting of the pusher at the first mounting block 14.

In another embodiment, the first mounting block 14 may be a solenoid valve, and the first piston push rod 3 may push the solenoid valve to adsorb the workpiece, so as to facilitate workpiece conveying.

Specifically, the second intake port 7 includes a second thrust port 71 and a second retraction port 72, the second thrust port 71 and the second retraction port 72 being located at both ends of the second chamber 5, respectively, and the second retraction port 72 being located at an end of the second piston rod 6 extending.

The second pushing air port 71 and the second retracting air port 72 are respectively provided with an air pipe, the second retracting air port 72 is positioned at one extending end of the second piston push rod 6, when the second piston push rod 6 needs to be extended, air is discharged into the second cavity 5 from the second pushing air port 71, the air pushes the second piston push rod 6 to slide out towards the second slide opening, the second piston push rod 6 extends outwards towards the second cavity 5, and the second piston push rod 6 is extended. When the second piston push rod 6 needs to retract, the gas is discharged into the second cavity 5 from the second retracting gas port 72, the gas pushes the second piston push rod 6 to move towards one end far away from the second slide port, the second piston push rod 6 moves towards the second cavity 5, and the second piston push rod 6 achieves retraction. The second pushing air port 71 and the second retracting air port 72 are respectively arranged at two ends of the second cavity 5, the second piston push rod 6 is pushed to move back and forth by using gas, the gas pushes the second piston push rod 6 to have larger pushing force, heavier devices or workpieces can be pushed, and the stability of the second piston push rod 6 is good when the gas pushes the second piston push rod 6, so that the materials or the workpieces can be pushed conveniently.

Specifically, one end of the second piston push rod 6 facing away from the working end is provided with a second sliding column 19, the diameter of the second sliding column 19 is larger than that of the second piston push rod 6, the second sliding column 19 is in sliding fit with the second cavity 5, and the peripheral surface of the second sliding column 19 is provided with a second sealing ring 20. The diameter of the second sliding column 19 is larger than that of the second piston push rod 6, so that a gas storage space is formed between the second piston push rod 6 and the second cavity 5, and gas can push the second sliding column 19 in the gas storage space to drive the second piston push rod 6 to move. The second seal ring 20 can prevent gas from leaking from one end of the second slide 19 to the other end when the second slide 19 slides in the second cavity 5.

Specifically, the second cavity 5 is provided with a second bearing cylinder 15, the second bearing cylinder 15 is detachably mounted at one end of the second cavity 5 for the second piston push rod 6 to extend out, a second slide way port penetrates through the second bearing cylinder 15, one end of the second bearing cylinder 15, which is close to the interior of the second cavity 5, is provided with a second retraction air gap 16, and the second retraction air port 72 is communicated with the second retraction air gap 16;

the other end of the second cavity 5 is provided with a second plug 17, one end of the second plug 17, which is close to the interior of the second cavity 5, is provided with a second propulsion air gap 18, and the second propulsion air port 71 is communicated with the position of the second propulsion air gap 18.

The second retracting air gap 16 is disposed at one end of the second bearing cylinder 15 near the second cavity 5, and even if the second sliding pillar 19 is attached to the second bearing cylinder 15, the air still flows into the second cavity 5 from the second retracting air port 72 to push the second sliding pillar 19 to move, and the second sliding pillar 19 drives the second piston push rod 6 to move.

The second pushing air gap 18 is disposed at one end of the second plug 17 near the second cavity 5, and even if the second sliding post 19 is attached to the second plug 17, the air still flows into the second cavity 5 from the second pushing air gap 18 to push the second sliding post 19 to move, and the second sliding post 19 drives the second piston push rod 6 to move.

One end of the second cavity 5 is provided with a second bearing cylinder 15, the other end of the second cavity 5 is provided with a second plug 17, the second bearing cylinder 15 and the second plug 17 are detachably mounted with the second cavity 5, and the second piston push rod 6 is convenient to mount or dismount in the second cavity 5, and the second piston push rod 6 is convenient to mount or maintain. The second bearing cylinder 15 and the second plug block 17 are in threaded fit with the second cavity 5, so that the installation is convenient.

Because the diameter of second slide 19 is greater than the diameter of second piston push rod 6, and second slide 19 is located the one end of second piston push rod 6, leads to the work end of second piston push rod 6 to produce the slope easily, is provided with second at the one end of second cavity 5 and bears a section of thick bamboo 15, and the second slide mouth sets up in the center of bearing a section of thick bamboo 15, and second bears a section of thick bamboo 15 can provide the supporting role for the work end of second piston push rod 6 obtains supporting, guarantees that the both ends of second piston push rod 6 are in the horizontality, makes things convenient for second piston push rod 6 to remove in second cavity 5.

Further, the working ends of the two sets of second piston pushrods 6 are fixedly connected by a second mounting block 21. The second piston push rod 6 can be connected with the pushing piece through the second mounting block 21, so that the pushing piece pushes against the material or the workpiece. The second mounting block 21 may be provided with a mounting hole, and the pushing member may be fixed to the second mounting block 21 by passing through the mounting hole with a bolt or a screw.

In another embodiment, the second mounting block 21 may be a solenoid valve, and the second piston push rod 6 may push the solenoid valve to adsorb the workpiece, so as to facilitate workpiece conveying.

Other constructions, etc., and operation of a bi-directional cylinder according to embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A bi-directional cylinder, characterized by: comprises a cylinder body, a first pushing component and a second pushing component;

the first pushing assembly comprises a first cavity, a first piston push rod, a first air inlet and a first slide way opening;

the second pushing assembly comprises a second cavity, a second piston push rod, a second air inlet and a second slide way opening;

the first cavity and the second cavity are respectively arranged in the cylinder body, the first piston push rod is slidably arranged in the first cavity, the second piston push rod is movably arranged in the second cavity, and the second piston push rod and the first piston push rod are parallel to each other and the working ends of the second piston push rod and the first piston push rod deviate from each other;

one end of the first cavity is provided with the first slide way opening, the working end of the first piston push rod extends out of the first cavity from the first slide way opening, one end of the second cavity is provided with the second slide way opening, and the working end of the second piston push rod extends out of the second cavity from the second slide way opening;

the first air inlet is communicated with the first cavity and is used for allowing air to flow into the first cavity so as to push the first piston push rod to move;

the second air inlet is communicated with the second cavity, and the second air inlet is used for allowing air to flow into the second cavity so as to enable the air to push the second piston push rod to move.

2. A bi-directional cylinder as defined in claim 1, wherein: the first pushing component and the second pushing component are respectively provided with two groups;

the working ends of the first piston push rods of the two groups of first pushing assemblies are connected, and the working ends of the second piston push rods of the two groups of second pushing assemblies are connected;

the positions of the two groups of first pushing assemblies are respectively positioned at the left lower position and the right upper position of the longitudinal section of the cylinder body;

the two groups of second pushing assemblies are respectively positioned at the right lower position and the left upper position of the longitudinal section of the cylinder body.

3. A bi-directional cylinder as defined in claim 1, wherein: the first air inlet comprises a first propelling air port and a first retracting air port, the first propelling air port and the first retracting air port are respectively positioned at two ends of the first cavity, and the first retracting air port is close to the working end of the first piston push rod.

4. A bi-directional cylinder as defined in claim 1, wherein: the one end that first piston push rod deviates from the working end is provided with first traveller, the diameter of first traveller is greater than the diameter of first piston push rod, first traveller with first cavity sliding fit, the global first sealing washer that is provided with of first traveller.

5. A bi-directional cylinder as claimed in claim 3, wherein: the first cavity is provided with a first bearing cylinder, the first bearing cylinder is detachably arranged at one end of the first cavity, which is used for the first piston push rod to extend out, the first slideway port penetrates through the first bearing cylinder, one end, close to the interior of the first cavity, of the first bearing cylinder is provided with a first retraction air gap, and the first retraction air port is communicated with the first retraction air gap;

the other end of the first cavity is provided with a first plug block, the first plug block is detachably mounted with the first cavity, one end, close to the inside of the first cavity, of the first plug block is provided with a first propulsion air gap, and the first propulsion air port is communicated with the first propulsion air gap.

6. A bi-directional cylinder as defined in claim 5, wherein: the working ends of the two groups of first piston push rods are fixedly connected through a first mounting block.

7. A bi-directional cylinder as defined in claim 1, wherein: the second air inlet comprises a second propelling air port and a second retracting air port, the second propelling air port and the second retracting air port are respectively positioned at two ends of the second cavity, and the second retracting air port is positioned at one end of the second piston push rod extending out.

8. A bi-directional cylinder as defined in claim 1, wherein: the one end that second piston push rod deviates from the working end is provided with the second traveller, the diameter of second traveller is greater than the diameter of second piston push rod, the second traveller with second cavity sliding fit, the global second sealing washer that is provided with of second traveller.

9. A bi-directional cylinder as defined in claim 7, wherein: the second cavity is provided with a second bearing cylinder, the second bearing cylinder is detachably arranged at one end of the second cavity, which is used for the second piston push rod to extend out, the second slideway port penetrates through the second bearing cylinder, one end, close to the interior of the second cavity, of the second bearing cylinder is provided with a second retraction air gap, and the second retraction air port is communicated with the second retraction air gap;

the other end of the second cavity is provided with a second plug, one end of the second plug, which is close to the inside of the second cavity, is provided with a second propulsion air gap, and the second propulsion air port is communicated with the position of the second propulsion air gap.

10. A bi-directional cylinder as defined in claim 9, wherein: the working ends of the two groups of second piston push rods are fixedly connected through a second mounting block.