CN220956255U - Leak detection structure of pneumatic-hydraulic cylinder - Google Patents

Abstract

The utility model discloses a leakage detection structure of a pneumatic-hydraulic cylinder, which comprises a cylinder body, wherein a piston is arranged in the cylinder body, a piston rod with the end part extending out of the cylinder body is connected to the piston, an air chamber and an oil chamber are correspondingly formed in the cylinder body at two sides of the piston respectively, an air seal piece is arranged between the piston and the cylinder body at one side close to the air chamber, an oil seal piece is arranged between the piston and the cylinder body at one side close to the oil chamber, a leakage detection cavity is arranged between the air seal piece and the oil seal piece, and a leakage detection opening communicated with the leakage detection cavity is formed in the piston rod. The advantages are that: the leakage detecting device has the advantages that the structure is simple and reasonable, the leakage detecting cavity is arranged between the air sealing piece and the oil sealing piece, and once the air sealing piece or the oil sealing piece fails, the fault condition can be conveniently observed from the leakage detecting port, so that the maintenance is timely carried out.

Description

Leak detection structure of pneumatic-hydraulic cylinder

Technical Field

The utility model relates to the technical field of pneumatic-hydraulic cylinder manufacturing, in particular to a leak detection structure of a pneumatic-hydraulic cylinder.

Background

The cylinder and the hydraulic cylinder are power elements commonly used in mechanical equipment. The cylinder converts air pressure energy into mechanical energy to guide the piston to do linear and repeated motion, and the hydraulic cylinder converts hydraulic energy into mechanical energy to guide the piston to do linear and repeated motion. The cylinder has the characteristic of high response speed, but the output pressure of the cylinder is smaller than that of the hydraulic cylinder due to the compressibility of gas; the cylinder can provide a larger output pressure. The pneumatic-hydraulic cylinder is a device combining a cylinder and a hydraulic cylinder.

Be provided with air chamber and grease chamber in the pneumatic-hydraulic cylinder, the air chamber needs the air seal piece to seal, and the grease chamber needs the oil seal piece to seal, in case air seal piece or oil seal piece inefficacy all can cause the normal operating of equipment, when slight leakage appears, equipment still can normally work, but work efficiency and the work effect of equipment can decline, when leaking great, equipment just can not normally work. Because there are many reasons that cause a equipment work efficiency and work effect to descend, work efficiency and work effect's decline do not explicitly point to leakage, the inefficacy of atmoseal piece or oil blanket piece, and operating personnel need to troubleshoot possible fault point one by one, and is troublesome, laborious, and atmoseal piece or oil blanket piece are installed inside equipment moreover, and its assembly requirement is higher, and it is comparatively troublesome to dismantle, if can directly find the fault point, can practice thrift manpower, material resources greatly, improves production efficiency.

Disclosure of utility model

The utility model aims to overcome the defects, and discloses a leakage detection structure of a pneumatic-hydraulic cylinder, which has the advantages of simple and reasonable structure, convenient leakage detection and timely and effective leakage detection.

The technical scheme of the utility model is realized as follows:

The utility model provides a leak hunting structure of pneumatic cylinder, includes the cylinder body, the cylinder body in be provided with the piston, the piston on be connected with the tip and stretch out the piston rod of cylinder body, the cylinder body in the both sides of piston correspond respectively and be formed with air chamber and grease chamber, piston and cylinder body between be provided with the air seal piece in being close to air chamber one side, piston and cylinder body between be provided with the oil blanket piece in being close to grease chamber one side, air seal piece and oil blanket piece between be provided with leak hunting chamber, the piston rod on be provided with the communicating leak hunting mouth in leak hunting chamber.

The measures for further optimizing the technical scheme are as follows:

As an improvement, the leak detection cavity is of an annular structure. The leak hunting chamber is annular structure and sets up on the outer wall of piston, that is to say, leak hunting chamber and atmoseal piece, oil sealing piece parallel arrangement, and the trouble appears in atmoseal piece or the optional position of oil sealing piece, and corresponding gas or hydraulic oil can all get into leak hunting chamber soon, finally reaches the leak hunting mouth, so the setting can improve the timeliness of leak hunting.

As an improvement, a central cavity is arranged in the middle of the piston, a first radial hole is arranged on the piston, the outer end of the first radial hole is communicated with the leak detection cavity, and the inner end of the first radial hole is communicated with the central cavity. The leak detection cavity is communicated with the central cavity in the middle of the piston through a first radial hole arranged on the piston, in other words, gas and hydraulic oil entering the leak detection cavity can enter the central cavity through the first radial hole.

As an improvement, the center of the piston rod is provided with an axial hole, the head of the piston rod is provided with a second radial hole, the outer end of the second radial hole is communicated with the leak detection port, the inner end of the second radial hole is communicated with the axial hole, and the rear end of the axial hole extends to the end face of the piston rod and is communicated with the central cavity of the piston. The central cavity is communicated with the leakage detecting port through the axial hole and the second radial hole, in other words, the gas and the hydraulic oil entering the central cavity pass through the axial hole and the second radial hole and finally flow to the leakage detecting port.

As an improvement, one end of the air seal piece is provided with an air seal piece expansion part, and the air seal piece expansion part is arranged towards the air chamber. When the piston is installed in the cylinder body, the air seal expansion part is extruded to enter the installation groove, and the air seal expansion part has a tendency to bulge outwards due to the elasticity of the air seal expansion part, so that the air seal is tightly contacted with the inner wall of the cylinder body to form a seal.

As an improvement, one end of the oil seal is provided with an oil seal expansion part, and the oil seal expansion part is arranged towards the oil chamber. Similarly, the oil seal expansion part extends out of the surface of the mounting groove when the oil seal is embedded in the mounting groove, when the piston is mounted in the cylinder body, the oil seal expansion part is extruded to enter the mounting groove, and the oil seal expansion part has a tendency to bulge outwards due to the elasticity of the oil seal expansion part, so that the oil seal is tightly contacted with the inner wall of the cylinder body to form a seal.

As an improvement, a guide ring is arranged between the piston and the cylinder body and between the air sealing piece and the oil sealing piece. The guide ring is arranged, so that the flexibility and smoothness of the movement of the piston in the cylinder body can be improved.

As an improvement, the rear end of the piston rod is provided with a central boss, and the middle part of the piston is provided with an assembly cavity matched with the central boss. The center boss is matched with the assembly cavity, so that the piston rod and the piston can be positioned in advance before being fixed, and the coaxiality of the piston rod and the piston after being fixed can be improved.

As an improvement, a convex ring is fixed on the periphery of one side of the piston, which is close to the oil chamber. The convex ring is arranged, so that a cavity is formed in the convex ring, and the cavity gives a prepositive space for injecting hydraulic oil, so that the hydraulic oil can be smoothly injected.

As an improvement, the cylinder body comprises a cylinder body and a cylinder cover which are fixed mutually, and a sealing ring is arranged between the cylinder body and the cylinder cover. The sealing ring is arranged, so that the tightness between the cylinder body and the cylinder cover is effectively improved.

Compared with the prior art, the utility model has the advantages that:

The leakage detection structure of the pneumatic-hydraulic cylinder has a simple and reasonable structure, and the leakage detection cavity is arranged between the air sealing piece and the oil sealing piece, so that once the air sealing piece or the oil sealing piece fails, the fault condition can be conveniently observed from the leakage detection opening, and the maintenance can be timely carried out. Once the air seal piece fails, the leakage detection port can leak air, once the oil seal piece fails, the leakage detection port can leak oil, and the air seal piece or the oil seal piece can be conveniently judged to fail by observing the leakage detection port to replace in time, so that the normal operation of the equipment is guaranteed.

Drawings

FIG. 1 is a partial cross-sectional perspective view of an embodiment of the present utility model;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is a cross-sectional schematic diagram of an embodiment of the utility model;

FIG. 5 is an enlarged view of portion C of FIG. 4;

fig. 6 is a perspective view of the piston of fig. 4.

The names of the reference numerals in the drawings of the present utility model are:

The cylinder body 1, the sealing ring 1a, the air chamber 11, the oil chamber 12, the cylinder body 13, the cylinder cover 14, the piston 2, the leak detection chamber 2a, the central chamber 2b, the first radial hole 2c, the assembly chamber 21, the convex ring 22, the piston rod 3, the leak detection port 3a, the axial hole 3b, the second radial hole 3c, the central boss 31, the air seal 4, the air seal expansion part 41, the oil seal 5, the oil seal expansion part 51 and the guide ring 6.

Detailed Description

The utility model is described in further detail below with reference to the accompanying drawings:

The following description is presented to enable one of ordinary skill in the art to practice the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. indicate orientations or positions based on the orientation or positional relationship shown in the drawings, which are merely for convenience in describing the present simplified description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus the above terms are not to be construed as limiting the present utility model.

It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.

As shown in fig. 1 to 6, a leak detection structure of a pneumatic hydraulic cylinder comprises a cylinder body 1, wherein a piston 2 is arranged in the cylinder body 1, a piston rod 3 with an end part extending out of the cylinder body 1 is connected to the piston 2, an air chamber 11 and an oil chamber 12 are correspondingly formed on two sides of the piston 2 in the cylinder body 1 respectively, an air seal 4 is arranged between the piston 2 and the cylinder body 1 on one side close to the air chamber 11, an oil seal 5 is arranged between the piston 2 and the cylinder body 1 on one side close to the oil chamber 12, a leak detection cavity 2a is arranged between the air seal 4 and the oil seal 5, and a leak detection port 3a communicated with the leak detection cavity 2a is formed in the piston rod 3.

The leak detection cavity 2a is of an annular structure. The air seal 4 and the oil seal 5 are in a circular ring structure, the leak detection cavity 2a is arranged on the outer wall of the piston 2 by adopting a circular structure, in other words, the leak detection cavity 2a, the air seal 4 and the oil seal 5 are arranged in parallel, so long as leakage occurs at any point on the air seal 4 and the oil seal 5, corresponding gas and hydraulic oil can quickly enter the leak detection cavity 2a and finally enter the communicated cavity, and the leak detection cavity is embodied at the leak detection port 3a, so that the leak detection timeliness can be effectively improved, operators can find the leakage condition of the air seal 4 or the oil seal 5 of the device in a near-early manner, and the air seal 4 or the oil seal 5 can be replaced in time.

As shown in fig. 1, a central cavity 2b is disposed in the middle of the piston 2, a first radial hole 2c is disposed on the piston 2, an outer end of the first radial hole 2c is communicated with the leak detection cavity 2a, and an inner end of the first radial hole 2c is communicated with the central cavity 2 b.

The center of the piston rod 3 is provided with an axial hole 3b, the head of the piston rod 3 is provided with a second radial hole 3c, the outer end of the second radial hole 3c is communicated with the leak detection port 3a, the inner end of the second radial hole 3c is communicated with the axial hole 3b, and the rear end of the axial hole 3b extends to the end face of the piston rod 3 and is communicated with the central cavity 2b of the piston 2.

Here, a passage is established between the leak detection chamber 2a and the leak detection port 3a, the leak detection chamber 3a communicates with the central chamber 2b in the middle of the piston 2 through a first radial hole 2c provided in the piston 2, and the central chamber 2b communicates with the leak detection port 3a through an axial hole 3b and a second radial hole 3 c. In other words, the gas and hydraulic oil entering the leak detection chamber 2a will enter the central chamber 2b through the first radial hole 2c, and then will flow to the leak detection port 3a through the axial hole 3b and the second radial hole 3 c. The leak detection port 3a is arranged at the head part of the piston rod 3 (the end face of the cylinder cover 14 is unexpected), and in the reciprocating motion process of the piston rod 3, the leak detection port 3a is always exposed outside, and an operator can conveniently observe the condition of the leak detection port 3a, so that whether the air sealing piece 4 and the oil sealing piece 5 leak or not can be rapidly judged.

The manner in which the passage is established between the leak detection chamber 2a and the leak detection port 3a is not the only one as long as communication is enabled between the leak detection chamber 2a and the leak detection port 3 a.

As shown in fig. 2, one end of the air seal 4 is provided with an air seal expansion portion 41, and the air seal expansion portion 41 is disposed toward the air chamber 11. In this embodiment, the cross section of the air seal expansion part 41 is in a herringbone structure, in order to avoid the axial position of the air seal 4 from moving during the reciprocating movement of the piston 2, an annular mounting groove is generally formed on the outer wall of the piston 2, the air seal expansion part 41 extends out of the surface of the mounting groove when the air seal 4 is embedded in the mounting groove, when the piston 2 is installed in the cylinder 1, the air seal expansion part 41 is extruded to enter the mounting groove, and due to the elasticity of the air seal expansion part 41, the air seal expansion part has a tendency to bulge outwards, so that the air seal 4 is tightly contacted with the inner wall of the cylinder 1 to form a seal. Since the pressure is derived from the air pressure in the air chamber 11 on the air chamber side, the air seal expansion portion 41 is provided toward the air chamber 11. Of course, other structures may be used for the air seal expansion portion 41, as long as the sealing purpose can be achieved.

Because the pressure on the oil chamber side is relatively high, a plurality of oil seals 5 are typically provided on the piston 2, and in this embodiment, two oil seals 5 are provided. As shown in fig. 2, one end of the oil seal 5 is provided with an oil seal expansion portion 51, and the oil seal expansion portion 51 is provided toward the oil chamber 12. In this embodiment, the cross section of the oil seal expansion part 51 is also in a herringbone structure, so that in order to avoid the axial position of the oil seal 5 from moving during the reciprocating movement of the piston 2, an annular mounting groove is formed on the outer wall of the piston 2, the oil seal expansion part 51 extends out of the surface of the mounting groove when the oil seal 5 is embedded in the mounting groove, and when the piston 2 is installed in the cylinder 1, the oil seal expansion part 51 is extruded into the mounting groove, and has a tendency to bulge outwards due to the elasticity of the oil seal expansion part 51, so that the oil seal 5 is tightly contacted with the inner wall of the cylinder 1 to form a seal. Since the pressure is derived from the oil pressure in the oil chamber 12 on the oil chamber side, the oil seal expansion portion 51 is provided toward the oil chamber 12. Of course, the oil seal expansion portion 51 may take other configurations as long as the sealing purpose can be achieved.

A guide ring 6 is arranged between the air seal 4 and the oil seal 5 between the piston 2 and the cylinder body 1. The guide ring 6 can improve the flexibility and smoothness of the movement of the piston 2. As shown in fig. 2, in this embodiment, the guide ring 6 is disposed between the air seal 4 and the leak detection chamber 2a, so that the space layout is more reasonable, and the leak detection chamber 2a can be located in the middle of the piston 2. Of course, other positions of the guide ring 6 between the piston 2 and the cylinder 1 are also possible.

The rear end of the piston rod 3 is provided with a central boss 31, and the middle part of the piston 2 is provided with an assembly cavity 21 which is matched with the central boss 31. When the piston rod 3 is assembled with the piston 2, the central boss 31 of the piston rod 3 is inserted into the assembly cavity 21 of the piston 2, so that pre-fixation can be formed, and the assembly between the piston rod 3 and the piston 2 is convenient; the two are fixed by bolts, and the coaxiality between the piston rod 3 and the piston 2 can be improved due to the fact that the central boss 31 is inserted and matched with the assembling cavity 21.

A convex ring 22 is fixed on the periphery of one side of the piston 2 close to the oil chamber 12. Due to the arrangement of the convex ring 22, a cavity is formed in the convex ring 22, so that a gap is formed between the end face of the piston 2 and the oil inlet, and a reserved space is reserved for injecting hydraulic oil, so that the hydraulic oil can be smoothly injected. If the gap does not exist, the caliber of the oil inlet is smaller, and hydraulic oil in the oil inlet directly acts on the end face of the piston 2, so that the piston 2 can be pushed to move by extremely high pressure.

The cylinder body 1 comprises a cylinder body 13 and a cylinder cover 14 which are fixed with each other, and a sealing ring 1a is arranged between the cylinder body 13 and the cylinder cover 14. The provision of the seal ring 1a can improve the sealability between the cylinder body 13 and the cylinder head 14.

Working principle:

an air seal 4 is arranged between the piston 2 and the cylinder body 1 at the air chamber side to ensure the tightness of the air chamber side, and an oil seal 5 is arranged at the oil chamber side to ensure the tightness of the oil chamber side; on the piston 2, a leak detection chamber 2a is provided between the gas seal 4 and the oil seal 5.

Once the air seal 4 fails, the air in the air chamber 11 enters the leak detection cavity 2a through the air seal 4, passes through the first radial hole 2c on the piston 2, the central cavity 2b of the piston 2, the axial hole 3b on the piston rod 3 and the second radial hole 3c on the piston rod 3, and finally flows to the leak detection port 3a, and then an operator can observe the air leakage phenomenon at the leak detection port 3 a. That is, once the operator observes the leakage phenomenon at the leakage detecting port 3a, it indicates that the air seal 4 is leaked and needs to be replaced.

Likewise, once the oil seal 5 fails, hydraulic oil in the oil chamber 12 enters the leak detection chamber 2a through the oil seal 5, passes through the first radial hole 2c in the piston 2, the central chamber 2b in the piston 2, the axial hole 3b in the piston rod 3, and the second radial hole 3c in the piston rod 3, and finally flows to the leak detection port 3a, and then an operator can observe the leak phenomenon at the leak detection port 3 a. That is, once the operator observes the oil leakage at the leak detection port 3a, it indicates that the oil seal 5 is leaked and needs to be replaced.

In conclusion, an operator can conveniently judge that the air sealing piece 4 or the oil sealing piece 5 fails by observing the leakage or oil leakage of the leakage detecting port 3a so as to replace the air sealing piece in time, and then the normal operation of the equipment is ensured.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The objects of the present utility model have been fully and effectively achieved. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.

Claims (10)

1. The utility model provides a leak hunting structure of pneumatic cylinder, including cylinder body (1), cylinder body (1) in be provided with piston (2), piston (2) on be connected with the tip and stretch out piston rod (3) of cylinder body (1), characterized by: the cylinder body (1) in be in both sides of piston (2) correspond respectively and be formed with air chamber (11) and grease chamber (12), piston (2) and cylinder body (1) between be provided with air seal (4) in being close to air chamber (11) one side, piston (2) and cylinder body (1) between be provided with oil blanket (5) in being close to grease chamber (12) one side, air seal (4) and oil blanket (5) between be provided with leak hunting chamber (2 a), piston rod (3) on be provided with leak hunting mouth (3 a) that leak hunting chamber (2 a) communicates with each other.

2. The leak detection structure of a pneumatic cylinder as defined in claim 1, wherein: the leak detection cavity (2 a) is of an annular structure.

3. The leak detection structure of a pneumatic cylinder as defined in claim 2, wherein: the middle part of piston (2) be provided with central chamber (2 b), piston (2) on be provided with first radial hole (2 c), the outer end of first radial hole (2 c) with leak hunting chamber (2 a) communicate with each other, the inner of first radial hole (2 c) with central chamber (2 b) communicate with each other.

4. A pneumatic-hydraulic cylinder leak detection structure as defined in claim 3, wherein: the center of the piston rod (3) is provided with an axial hole (3 b), the head of the piston rod (3) is provided with a second radial hole (3 c), the outer end of the second radial hole (3 c) is communicated with the leak detection port (3 a), the inner end of the second radial hole (3 c) is communicated with the axial hole (3 b), and the rear end of the axial hole (3 b) extends to the end face of the piston rod (3) and is communicated with the central cavity (2 b) of the piston (2).

5. The leak detection structure of a pneumatic cylinder as defined in claim 4, wherein: one end of the air seal (4) is provided with an air seal expansion part (41), and the air seal expansion part (41) is arranged towards the air chamber (11).

6. The leak detection structure of a pneumatic cylinder as defined in claim 4, wherein: one end of the oil seal (5) is provided with an oil seal expansion part (51), and the oil seal expansion part (51) is arranged towards the oil chamber (12).

7. A pneumatic cylinder leak detection structure as defined in claim 5 or 6, wherein: a guide ring (6) is arranged between the piston (2) and the cylinder body (1) and between the air sealing piece (4) and the oil sealing piece (5).

8. The leak detection structure of a pneumatic cylinder as defined in claim 7, wherein: the rear end of the piston rod (3) is provided with a central boss (31), and the middle part of the piston (2) is provided with an assembly cavity (21) matched with the central boss (31).

9. The leak detection structure of a pneumatic cylinder as defined in claim 8, wherein: a convex ring (22) is fixed on the periphery of one side, close to the oil chamber (12), of the piston (2).

10. The leak detection structure of a pneumatic cylinder as defined in claim 9, wherein: the cylinder body (1) comprises a cylinder body (13) and a cylinder cover (14) which are fixed mutually, and a sealing ring (1 a) is arranged between the cylinder body (13) and the cylinder cover (14).