Pneumatic expansion piece

Abstract

The utility model discloses a pneumatic expansion piece which comprises a shell, a piston shaft, a front cover and a rear cover, a cavity is formed by the shell, the front cover and the rear cover, the piston shaft stretches out and draws back in the cavity in the axial direction, and a main gas circuit and a reversing valve communicated with the main gas circuit are arranged on the shell. The two ends of the shell are further provided with an extension adjusting assembly and a retraction adjusting assembly which control reversing of the reversing valve respectively, the piston shaft comprises a shaft body and a disc body coaxially and fixedly connected with the shaft body, and the disc body, the front end cover, the rear end cover, the piston shaft and the shell divide a cavity into a first cavity and a second cavity. The shell is provided with a retraction gas circuit communicated with the first cavity and an extension gas circuit communicated with the second cavity, the extension adjusting assembly comprises a first valve block, a first pilot valve, a first deflector rod and a first bolt which are arranged on the shell, and the first bolt can eject the first pilot valve open to enable the second cavity to lose pressure. The device has the advantages that the scraper connected with the piston shaft can be conveniently driven in a reciprocating mode, and the device is suitable for humid and dusty environments.

Description

TECHNICAL FIELD

[0001] The utility model relates to reciprocating mechanism field, concretely is a pneumatic telescopic device. BACKGROUND

[0002] When the roller of various machines rotates, the scraper or the scraping plate for cleaning the dust, garbage and other dirt on the roller surface is generally mounted on the roller, the pneumatic driver is mounted on the shaft end of the scraping plate, and the scraping plate is pulled to make axial reciprocating movement, so that the secondary cutting effect of the scraper or the scraping plate on the roller surface is realized, and the scraping effect is better. The traditional motor speed reduction mechanism drives the mechanical eccentric wheel or the crank connecting rod to drive the scraper or the scraping plate to reciprocate, which is not suitable for use in humid and dusty environments.

[0003] Therefore, it is necessary to provide a pneumatic telescopic device. SUMMARY

[0004] The utility model provides a kind of pneumatic telescopic device, effectively solve the existing pneumatic reciprocating device is not suitable for in humid environment or in dusty environment operation.

[0005] The utility model discloses the technical scheme that is adopted is:

[0006] Pneumatic telescopic device, including shell, piston shaft, the front cover being arranged at the front end of shell and the rear cover being arranged at the rear end of shell, the shell, the front cover and the rear cover form cavity, the piston shaft is retracted in cavity along axial direction, the shell is provided with main gas path and the reversing valve being communicated with main gas path. The shell is also provided with the extension adjustment assembly and the retraction adjustment assembly respectively at both ends, which control the reversing of the reversing valve, the piston shaft includes shaft body and disc body coaxially fixedly connected with shaft body, the disc body, the front end cover, the rear end cover, the piston shaft and the shell separate the cavity into No. 1 cavity and No. 2 cavity, the shell is provided with retraction gas path being communicated with No. 1 cavity and extension gas path being communicated with No. 2 cavity, the reversing valve supplies gas to No. 1 cavity or No. 2 cavity, the extension adjustment assembly and the retraction adjustment assembly are same structure, the extension adjustment assembly includes No. 1 valve block being arranged on the shell, No. 1 pilot valve for controlling the communication of No. 1 valve block, No. 1 lever being hingedly arranged on No. 1 pilot valve and No. 1 bolt being fixedly arranged on one side of lever, the No. 1 bolt can open No. 1 pilot valve and make No. 2 cavity lose pressure.

[0007] Further, the shell is also provided with a speed regulating valve, and the speed regulating valve is used to control the flow of the reversing valve.

[0008] Further, the shell is provided with a bidirectional channel bridge pipe, and the bidirectional channel bridge pipe forms the retraction gas path and the extension gas path.

[0009] Further, the disc body side wall is provided with a piston ring.

[0010] Further, the front end of the shaft body is provided with external threads.

[0011] Further, the front end cover is provided with a plurality of wire holes.

[0012] The piston shaft can be automatically reversed, the scraper connected with the piston shaft can be reciprocatingly driven, and the utility model is suitable for environments with high humidity and much dust. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A cross-sectional view of the pneumatic telescopic device provided by the embodiment of the present application.

[0014] Figure 2 A schematic view of the piston shaft, the extension adjusting assembly, the retraction adjusting assembly and the speed adjusting valve of the pneumatic telescopic device provided by the embodiment of the present application.

[0015] Figure 3 A side view of the pneumatic telescopic device provided by the embodiment of the present application.

[0016] Figure 4 A schematic view of the b port and the c port conduction, the d port and the e port conduction of the reversing valve core of the reversing valve of the pneumatic telescopic device provided by the embodiment of the present application.

[0017] Figure 5 A schematic view of the a port and the b port conduction, the c port and the d port conduction of the reversing valve core of the reversing valve of the pneumatic telescopic device provided by the embodiment of the present application.

[0018] Figure 6 A schematic view of all the gas ports of the reversing valve core of the reversing valve of the pneumatic telescopic device provided by the embodiment of the present application.

[0019] In the figure, 1 is a shell, 2 is a piston shaft, 3 is a front cover, 4 is a rear cover, 5 is a reversing valve, 6 is an extension adjusting assembly, 7 is a retraction adjusting assembly, 21 is a shaft body, 22 is a disc body, 101 is a first cavity, 102 is a second cavity, 61 is a first valve block, 62 is a first pilot valve, 63 is a first lever, 64 is a first bolt, 8 is a speed adjusting valve, 9 is a two-way passage bridge pipe, 10 is a piston ring, 51 is a reversing valve core, 501 is a reversing cavity body. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0021] As Figure 1 and Figure 3As shown, the embodiment provided by the present application is a pneumatic telescopic device, which comprises a shell 1, a piston shaft 2, a front cover 3 arranged at the front end of the shell 1, and a rear cover 4 arranged at the rear end of the shell 1. The shell 1, the front cover 3 and the rear cover 4 form a cavity, the piston shaft 2 is telescopic in the cavity along the axial direction, the shell 1 is provided with a main gas path and a reversing valve 5 communicated with the main gas path. As shown in Figure 2 As shown, the shell 1 is further provided with an extension adjusting assembly 6 and a retraction adjusting assembly 7 at both ends respectively for controlling the reversing of the reversing valve 5. The piston shaft 2 comprises a shaft body 21 and a disc body 22 fixedly connected coaxially with the shaft body 21. The disc body 22, the front end cover, the rear end cover, the piston shaft 2 and the shell 1 divide the cavity into a first cavity 101 and a second cavity 102. The shell 1 is provided with a retraction gas path communicated with the first cavity 101 and an extension gas path communicated with the second cavity 102. The reversing valve 5 supplies gas to the first cavity 101 or the second cavity 102. The extension adjusting assembly 6 and the retraction adjusting assembly 7 are the same in structure. The extension adjusting assembly 6 comprises a first valve block 61 arranged on the shell 1, a first pilot valve 62 for controlling the communication of the first valve block 61, a first lever 63 hingedly arranged on the first pilot valve 62, and a first bolt 64 fixedly arranged on one side of the lever. The first bolt 64 can push open the first pilot valve 62 to make the second cavity 102 lose pressure.

[0022] In actual use, the pneumatic telescopic device of the present application is installed on an external roller rack, and then the reversing valve 5 is reversed to alternately provide gas pressure in the first cavity 101 and the second cavity 102, so that the piston shaft 2 is telescopic in the axial direction. In the extension process of the piston shaft 2, the piston shaft 2 will touch the extension adjusting assembly 6. In the retraction process of the piston shaft 2, the piston shaft 2 will touch the first lever 63 to drive the first lever 63 to rotate, and then the first lever 63 drives the first bolt 64 to move. The first bolt 64 touches the first pilot valve 62, and after the reversing valve 5 is reversed, the gas flows into the first cavity 101 along the retraction gas path through the electromagnetic valve. At this time, the second cavity 102 loses pressure, and the piston rod changes from the extension state to the retraction state. The principle of driving the piston shaft 2 to move under the cooperation of the extension adjusting assembly 6 and the retraction adjusting assembly 7 is shown in Figure 4 、 Figure 5 and Figure 6 As shown, the pilot valves of the extension adjusting assembly 6 and the retraction adjusting assembly 7 drive the reversing valve core 51 to move in the reversing valve cavity 501, so that the communication between a, b, c, d and e ports is switched, thereby realizing the change of gas pressure in the first cavity 101 and the second cavity 102, and further driving the piston shaft 2 to extend and retract.

[0023] In the above design, the automatic reversing of the piston shaft 2 can be realized, and the pneumatic mode can overcome the influence of humid environment and dusty environment, which is convenient for reciprocating driving of the scraper connected with the piston shaft 2, and is suitable for environments with high humidity and much dust.

[0024] Specifically, as shown in the figure, the shell 1 is further provided with a speed regulating valve 8, which is used to control the flow of the reversing valve 5. The speed regulating valve 8 is a standard part. Figure 2

[0025] In actual use, by rotating the screw inside the valve core of the speed regulating valve 8, the opening of the speed regulating valve 8 is adjusted, and then the flow of the reversing valve 5 is controlled, and the speed of the change of the air pressure in the first cavity 101 or the second cavity 102 is changed.

[0026] In the above design, the structure design of the speed regulating valve 8 can realize the adjustment of the air pressure change speed, and change the extension and retraction speed of the piston shaft 2.

[0027] Specifically, as shown in the figure, the shell 1 is further provided with a speed regulating valve 8, which is used to control the flow of the reversing valve 5. The speed regulating valve 8 is a standard part. Figure 1

[0028] In the above design, by setting the bridge pipe, it can no longer be installed on the outside of the shell 1.

[0029] Specifically, as shown in the figure, the shell 1 is further provided with a speed regulating valve 8, which is used to control the flow of the reversing valve 5. The speed regulating valve 8 is a standard part. Figure 1

[0030] In the above design, the piston ring 10 can enhance the air tightness between the first cavity 101 and the second cavity 102.

[0031] Specifically, the front end of the shaft body 21 is provided with external threads.

[0032] In the above design, the external threads can quickly threadedly connect the doctor blade or the scraper on the shaft body 21,

[0033] Specifically, the front end cover is provided with a plurality of wire holes.

[0034] In the above design, the wire holes can quickly realize the installation of external fixed parts.

[0035] It should be understood that the above is only a specific embodiment of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.​​​

Claims

1. A pneumatic telescopic device, comprising a housing (1), a piston shaft (2), a front cover (3) disposed at the front end of the housing (1), and a rear cover (4) disposed at the rear end of the housing (1), wherein the housing (1), the front cover (3), and the rear cover (4) form a cavity, the piston shaft (2) extends and retracts axially within the cavity, and the housing (1) is provided with a main air passage and a reversing valve (5) connected to the main air passage, characterized in that: The housing (1) is also provided with an extension adjustment assembly (6) and a retraction adjustment assembly (7) at both ends to control the reversing valve (5). The piston shaft (2) includes a shaft body (21) and a disc body (22) coaxially fixedly connected to the shaft body (21). The disc body (22), the front end cover, the rear end cover, the piston shaft (2), and the housing (1) divide the cavity into a first cavity (101) and a second cavity (102). The housing (1) is provided with a retraction air passage connected to the first cavity (101) and an extension air passage connected to the second cavity (102). The reversing valve (5) supplies air to chamber 1 (101) or chamber 2 (102). The extension adjustment assembly (6) and the retraction adjustment assembly (7) have the same structure. The extension adjustment assembly (6) includes a valve block (61) on the housing (1), a pilot valve (62) that controls the opening of the valve block (61), a lever (63) hinged on the pilot valve (62), and a bolt (64) fixed on one side of the lever. The bolt (64) can open the pilot valve (62) to depressurize chamber 2 (102).

2. The pneumatic expansion joint according to claim 1, characterized in that: The housing (1) is also provided with a speed regulating valve (8), which is used to control the flow rate of the reversing valve (5).

3. The pneumatic telescopic device according to claim 1, characterized in that: The housing (1) is provided with a bidirectional channel bridge pipe (9), which forms the retraction air passage and the extension air passage.

4. The pneumatic telescopic device according to claim 1, characterized in that: The side wall of the disc (22) is provided with piston rings (10).

5. The pneumatic expansion joint according to claim 1, characterized in that: The front end of the shaft body (21) is provided with an external thread.

6. The pneumatic expansion joint according to claim 1, characterized in that: The front end cover is provided with several wire holes.

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