Hydraulic cylinder with auxiliary cylinder barrel

Abstract

The hydraulic cylinder with the auxiliary cylinder barrel comprises a hydraulic cylinder body, the hydraulic cylinder body comprises a cylinder barrel, a piston mechanism partially arranged in the cylinder barrel and a cylinder bottom arranged at the end, away from the piston mechanism, of the hydraulic cylinder body, and the hydraulic cylinder body further comprises a connecting mechanism and the auxiliary cylinder barrel which are connected with each other. The connecting mechanism is connected with the cylinder barrel, and the auxiliary cylinder barrel is connected with the cylinder bottom. According to the hydraulic cylinder, the connecting mechanism and the auxiliary cylinder barrel are arranged between the cylinder barrel and the cylinder bottom of the hydraulic cylinder, so that the hydraulic cylinder can operate more stably and safely under the condition that the stroke requirement is short due to the fact that the axial size of the cylinder barrel is too long, meanwhile, the overall axial size of the hydraulic cylinder is convenient to change through the auxiliary cylinder barrel, installation is flexible, and manufacturing is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders with stroke limits, in particular to a hydraulic cylinder with a secondary cylinder barrel. Background Art

[0002] The stroke of the hydraulic cylinder sometimes needs to be limited by setting a limit ring according to the use requirements; the invention of Chinese patent application number CN202110682649.6 discloses a hydraulic cylinder stroke limit structure, the limit structure includes a first rear limit sleeve, a second rear limit sleeve, a first retaining ring, a second retaining ring, a sleeve and a shaft retaining ring; the first rear limit sleeve and the second rear limit sleeve are evenly arranged on the first end of the piston rod, and the distance from the side of the first rear limit sleeve away from the end of the first end to the end of the first end is equal to the distance from the side of the second rear limit sleeve away from the end of the first end to the end of the first end; wherein the first end of the piston rod extends out of the hydraulic cylinder; the first retaining ring is simultaneously embedded in the first rear limit sleeve and the piston rod, the second retaining ring is simultaneously embedded in the second rear limit sleeve and the piston rod, the sleeve and the shaft retaining ring are sequentially sleeved on the piston rod, and one side of the sleeve partially presses the first rear limit sleeve and the second rear limit sleeve respectively and is adjacent to the first end The end of the shaft retaining ring is against the other side of the sleeve and the end adjacent to the first end, the shaft retaining ring is partially embedded in the piston rod, the first retaining ring, the sleeve and the shaft retaining ring cooperate to fix the first rear limit sleeve on the piston rod, and the second retaining ring, the sleeve and the shaft retaining ring cooperate to fix the second rear limit sleeve on the piston rod; the limiting structure also includes a rear cylinder, and the first end of the piston rod is located in the rear cylinder; the limiting structure also includes a rear end cover, a guide sleeve, a front limit sleeve, and a baffle, the rear end cover, the guide sleeve and the front limit sleeve are sequentially sleeved on the piston rod, the guide sleeve and the baffle are located in the rear end cover, the front limit sleeve is partially located in the rear end cover, the guide sleeve, the front limit sleeve and the baffle are contacted in sequence, and the guide sleeve is against the cover plate of the rear end cover perpendicular to the axial direction of the piston rod, the end of the rear cylinder is located in the rear end cover and is spirally matched with the rear end cover to press the baffle, the front limit sleeve and the guide sleeve.

[0003] The hydraulic cylinder stroke limit mechanism sets two rear limit sleeves at one end of the piston rod located in the cylinder body of the hydraulic cylinder, and the rear limit sleeve cooperates with the front limit sleeve in the axial direction to limit the stroke of the hydraulic cylinder. In some special working occasions, when the original stroke size of the hydraulic cylinder is too long, and the actual required stroke size is too small than the original stroke size, the stroke limit structure of the hydraulic cylinder is used to limit the stroke, which makes the front limit sleeve and the rear limit sleeve too long, which is not conducive to the stability and safety of the hydraulic cylinder during operation, and at the same time causes a waste of material and processing costs. In addition, because the axial size of the cylinder barrel cannot be changed, the use scenario is limited. Utility Model Content

[0004] In view of the potential instability and insecurity of the hydraulic cylinder in the prior art that relies on a limit sleeve to limit the stroke, and the problem of material waste caused by the cylinder size being too long compared to the stroke size, the utility model provides a hydraulic cylinder with a secondary cylinder barrel that: (1) does not cause safety hazards during operation of the hydraulic cylinder due to the excessive length of the guide sleeve; (2) overcomes the problem of the stability of the hydraulic cylinder during operation being affected by the excessive length of the guide sleeve; and (3) when the use scenario is changed, the overall size of the hydraulic cylinder can be changed according to actual needs.

[0005] The specific technical solution of the utility model is:

[0006] A hydraulic cylinder with a secondary cylinder barrel comprises a hydraulic cylinder body, the hydraulic cylinder body comprises a cylinder barrel, a piston mechanism partially disposed in the cylinder barrel, and a cylinder bottom at one end of the hydraulic cylinder body away from the piston mechanism, and the hydraulic cylinder body further comprises a connecting mechanism and a secondary cylinder barrel connected to each other, wherein the connecting mechanism is connected to the cylinder barrel, and the secondary cylinder barrel is connected to the cylinder bottom. The secondary cylinder barrel is a barrel with a similar structure to the cylinder barrel, and the secondary cylinder barrel is connected between the cylinder bottom and the connecting mechanism to replace the axial dimension of the cylinder barrel and provide support, and the inner surface of the secondary cylinder barrel is not processed.

[0007] Further, the connecting mechanism includes a main body, the main body has a first end face and a second end face, the cylinder bottom has a third end face, the first end face and the second end face are respectively provided with a first boss and a second boss, the third end face is provided with a third boss, the part arranged on the first end face and located between the first boss and the outer side surface of the main body is a first supporting surface, the part arranged on the second end face and located between the second boss and the outer side surface of the main body is a second supporting surface, the part on the third end face located between the outer side surface of the third boss and the outer side surface of the cylinder bottom is a third supporting surface, and the first boss cooperates with the cylinder barrel, the second boss cooperates with the auxiliary cylinder barrel, the third boss cooperates with the auxiliary cylinder barrel, the first supporting surface is in contact with the end surface of the cylinder barrel away from the guide sleeve, the second supporting surface is in contact with the end surface of the auxiliary cylinder barrel away from the cylinder bottom, the second supporting surface is in contact with the auxiliary cylinder barrel, and the third supporting surface is in contact with the auxiliary cylinder barrel. The outer side surface of the boss structure of the connecting mechanism matches the inner side surface of the cylinder and the auxiliary cylinder, and the end surfaces of the cylinder and the auxiliary cylinder connected to the boss of the connecting mechanism fit with the supporting surfaces on the two end surfaces of the connecting mechanism, so that the connecting mechanism is connected to the cylinder and the auxiliary cylinder in the axial dimension. The other end surface of the auxiliary cylinder is connected to the cylinder bottom, and the boss structure of the cylinder bottom is the same as the boss structure on the side where the connecting mechanism is connected to the auxiliary cylinder, and the connection method is the same.

[0008] Furthermore, the first supporting surface and the end surface of the cylinder away from the guide sleeve fit together to form a first connecting seam, and the connecting mechanism is fixedly connected to the cylinder. The first supporting surface and the end surface of the cylinder away from the guide sleeve have a groove, and the groove is located radially outside the plane where the groove is located. The rest of the plane where the groove is located serves as the supporting surface, and the two oppositely arranged grooves have the same size. The first supporting surface and the end surface of the cylinder away from the guide sleeve fit together, and the grooves on the two planes are arranged oppositely, and the connecting seam is formed between the grooves on the two planes, which is convenient for subsequent fixed connection.

[0009] Preferably, the second support surface and the auxiliary cylinder are fitted to form a second connection seam, the third support surface and the auxiliary cylinder are fitted to form a third connection seam, and the auxiliary cylinder is fixedly connected to the connecting mechanism and the cylinder bottom respectively. The second support surface and the third support surface have a bevel, and both end surfaces of the auxiliary cylinder have a bevel. As a technical solution of the utility model, the second support surface of the connecting mechanism and the end surface where the auxiliary cylinder is connected to the connecting mechanism are processed with a bevel, the third support surface of the cylinder bottom and the end surface where the auxiliary cylinder is connected to the cylinder bottom are processed with a bevel, and the bevel is processed in the same way as the bevel of the first support surface. And the above two pairs of relatively arranged bevels form a second connection seam and a third connection seam, which is convenient for subsequent fixed connection.

[0010] Preferably, the second boss is connected to the auxiliary cylinder, and the third boss is connected to the auxiliary cylinder. As a technical solution of the utility model, the outer side surface of the second boss is connected to the inner side surface of the auxiliary cylinder, and the connection method can be threaded connection, and the outer side surface of the third boss is connected to the inner side surface of the auxiliary cylinder, and the connection method can be threaded connection. This technical solution makes the auxiliary cylinder detachable, which is suitable for the situation where the axial size of the hydraulic cylinder needs to be changed due to the change of the use scenario of the hydraulic cylinder.

[0011] Furthermore, the piston mechanism includes a guide sleeve connected to one end of the cylinder, a piston rod inserted into the guide sleeve, a piston placed in the cylinder and connected to the end of the piston rod located in the cylinder, a connecting shaft provided at the end of the piston rod located in the cylinder, and a limit sleeve sleeved on the piston rod.

[0012] Preferably, the piston comprises a big end and a small end, the inner radial dimension of the big end of the piston is smaller than the inner radial dimension of the small end of the piston, and the big end of the piston is radially provided with at least one hole from the outer side of the big end of the piston to the inner side of the big end of the piston; the limiting sleeve comprises a big end and a small end, the inner radial dimension of the big end of the limiting sleeve is smaller than the inner radial dimension of the small end of the limiting sleeve, and the big end of the limiting sleeve is radially provided with at least one hole from the inner side of the big end of the limiting sleeve to the outer side of the big end of the limiting sleeve; the limiting sleeve is located on the side of the piston close to the guide sleeve, and one side of the end of the big end of the limiting sleeve is in contact with one side of the end of the small end of the piston, and the inner side surface of the small end of the limiting sleeve is in contact with the side surface of the piston shaft.

[0013] Preferably, the inner side surface of one end of the cylinder away from the connecting mechanism has an annular groove, and the guide sleeve has an outer convex ring connected to the annular groove and a flange abutting against the end surface of the cylinder away from the connecting mechanism.

[0014] Preferably, the connecting shaft includes a first shaft section whose side surface is in contact with the inner side surface of the big end of the piston, a third shaft section whose side surface is in contact with the inner side surface of the big end of the limiting sleeve, and a second shaft section whose side surface is in contact with both the inner side surface of the small end of the piston and the inner side surface of the big end of the limiting sleeve, and the outer radial dimensions of the first shaft section, the second shaft section and the third shaft section increase successively; at least one hole is opened on the side surface of the first shaft section of the connecting shaft, and at least one hole is opened on the side surface of the second shaft section of the connecting shaft.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) the hydraulic cylinder with an auxiliary cylinder, the auxiliary cylinder can effectively limit the stroke range of the hydraulic cylinder, replacing the excessively long axial dimension of the hydraulic cylinder barrel; (2) at the same time, the production and manufacturing of the auxiliary cylinder is relatively simple, reducing the cost of the hydraulic cylinder barrel in the manufacturing process; (3) compared with the technical solution of limiting the position by a limit sleeve in the prior art, the present invention can make the hydraulic cylinder more stable and safer when working. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a first embodiment of a hydraulic cylinder with a secondary cylinder according to the utility model.

[0017] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0018] Figure 3 for Figure 1 A partial enlarged view of point B in the middle.

[0019] Figure 4 It is a structural schematic diagram of a second embodiment of a hydraulic cylinder with a secondary cylinder according to the utility model.

[0020] Figure 5 for Figure 4 A partial enlarged view of point C in the middle.

[0021] Figure 6 for Figure 4 A partial enlarged view of point D in the middle.

[0022] Description of reference numerals:

[0023] 1. Cylinder barrel; 2. Auxiliary cylinder barrel; 3. Connecting mechanism; 4. Cylinder bottom; 5. Piston structure; 11. Ring groove; 31. Connecting mechanism body; 32. First boss; 33. Second boss; 41. Third end face; 42. Third boss; 51. Piston shaft; 52. Connecting shaft; 53. Piston; 54. Limit sleeve; 55. Guide sleeve; 61. First connecting seam; 62. Second connecting seam; 63. Third connecting seam; 311. First end face; 312. Second end face; 313. First supporting surface; 314. Second supporting surface; 411. Third supporting surface; 521. First shaft section; 522. Second shaft section; 523. Third shaft section; 551. Outer convex ring; 552. Flange. DETAILED DESCRIPTION

[0024] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0025] The utility model provides a hydraulic cylinder with a secondary cylinder barrel. The preferred embodiment of the hydraulic cylinder with the secondary cylinder barrel is described below.

[0026] Embodiment 1

[0027] like Figure 1 As shown, the first embodiment of the hydraulic cylinder with a secondary cylinder barrel of the utility model includes a hydraulic cylinder body, the hydraulic cylinder body includes a cylinder barrel 1, a piston mechanism partially disposed in the cylinder barrel 1, a cylinder bottom 4 disposed at one end of the hydraulic cylinder body away from the piston mechanism, and further includes a connecting mechanism 3 and a secondary cylinder barrel 2 fixedly connected to each other, the connecting mechanism 3 is fixedly connected to the cylinder barrel 1, and the secondary cylinder barrel 2 is fixedly connected to the cylinder bottom 4. The maximum allowable length is the maximum dimension of the piston shaft 51 of the hydraulic cylinder extending out of the cylinder barrel 1 within the allowable stroke range. When the stroke actually required by the hydraulic cylinder is smaller than the maximum allowable length, according to the prior art design, the axial dimension of the limiting sleeve 54 inside the cylinder body 1 needs to be lengthened to achieve the purpose of limiting the hydraulic cylinder, resulting in waste in the dimensions of the hydraulic cylinder body 1, the limiting sleeve 54 and the piston shaft 51, and the dimensions of the cylinder barrel 1, the limiting sleeve 54 and the piston shaft 51 that are too long make the hydraulic cylinder have poor stability and safety hazards during operation.

[0028] Among them, the connecting mechanism 3 includes a main body 31. The main body 31 of the connecting mechanism 3 given in the first embodiment is a disc structure. The main body 3 has a first end face 311 and a second end face 312. The first end face 311 faces the cylinder barrel 1, and the second end face 312 faces the auxiliary cylinder barrel 2. The cylinder bottom 4 is provided with a third end face 41. The first end face 311 and the second end face 312 are respectively provided with a first boss 32 and a second boss 33. The third end face 41 is provided with a third boss 42. The first boss 32, the second boss 33 and the third boss 42 given in the first embodiment are all annular bosses. The portion of the first end face 311 located between the outer side surface of the first boss 32 and the outer side surface of the main body 31 is the first supporting surface 313, and the portion of the second end face 312 located between the outer side surface of the second boss 33 and the outer side surface of the main body 31 is the first supporting surface 313. It is the second supporting surface 314, the portion of the third end surface 41 located between the outer side surface of the third boss 42 and the outer side surface of the cylinder bottom 4 is the third supporting surface 411, and the outer side surface of the first boss 32 is transitionally matched with the inner side surface of the cylinder 1, the outer side surface of the second boss 33 is transitionally matched with the inner side surface of the auxiliary cylinder 2, the outer side surface of the third boss 42 is transitionally matched with the inner side surface of the auxiliary cylinder 2, the first supporting surface 313 is in contact with the end surface of the cylinder 1 away from the guide sleeve 55, and the second supporting surface 314 is in contact with the end surface of the auxiliary cylinder 2 away from the cylinder bottom 4; the cylinder bottom 4 has a third end surface 41, and the third end surface 41 is provided with a third boss 42, and the portion of the third end surface 41 located between the outer side surface of the third boss 42 and the outer side surface of the cylinder bottom 4 is the third supporting surface 411, and the third supporting surface 411 is in contact with the end surface of the auxiliary cylinder 2 away from the cylinder 1.

[0029] like Figure 2 As shown, the first support surface 313 and the end surface of the cylinder 1 away from the guide sleeve 55 are arranged opposite to each other and fit to form a first connection seam 61, and the connection mechanism 3 is fixedly connected to the cylinder 1. In the first embodiment, the first support surface 313 and the end surface of the cylinder 1 away from the guide sleeve 55 are processed to form a groove, and the fixed connection method is welding connection. The two grooves of the first connection seam 61 are arranged opposite to each other to form a weld. Figure 3 As shown, the second support surface 314 and the end surface of the auxiliary cylinder 2 away from the cylinder bottom 4 are fitted to form a second connection seam 62, and the third support surface 411 and the end surface of the auxiliary cylinder 2 away from the cylinder 1 are fitted to form a third connection seam 63. The second support surface 314 and the third support surface 411 have grooves, and the two end surfaces of the auxiliary cylinder 2 have grooves, and the auxiliary cylinder 2 is fixedly connected to the connecting mechanism 3 and the cylinder bottom 4 respectively. The connection method between the auxiliary cylinder 2 and the connecting mechanism 3 and the connection method between the auxiliary cylinder 2 and the cylinder bottom 4 are both welding connections, and the grooves arranged oppositely in the second connection seam 314 and the third connection seam 411 are both welds. The above grooves are all processed in the same way, the bottom of the groove is rounded, and the slope angle of the groove is 7.5°. The remaining parts of the first connection seam 61, the second connection seam 62 and the third connection seam 63 after the grooves are processed are blunt edges of the welds. The above welding method is submerged arc automatic welding. According to different actual conditions, the scheme given in this embodiment 1 can be improved according to the welding method and surface treatment actually required.

[0030] like Figure 1 As shown, the piston mechanism 5 includes a guide sleeve 55 connected to one end of the cylinder 1 and playing a guiding and limiting role, a piston rod 11 inserted in the guide sleeve 55, one end of the piston rod 11 is inside the cylinder 1, and the other end is outside the cylinder 1, a piston 53 is placed in the cylinder 1 and connected to the end of the piston rod 11 located inside the cylinder 1, a connecting shaft 52 is provided at the end of the piston rod 11 located in the cylinder 1, and a limiting sleeve 54 is sleeved on the piston rod 11. The limiting sleeve 54 and the guide sleeve 55 cooperate with each other at two ends close to each other, and play a limiting role in the process of the reciprocating motion of the piston 53.

[0031] The piston 53 includes a large end and a small end, and at least one hole is radially opened at the large end of the piston 53. In the first embodiment, the hole at the large end of the piston 53 is a countersunk through hole opened from the outer surface to the inner surface, and the inner surface of the through hole is threaded. The piston 53 is sleeved on the connecting shaft 52 and fixed on the connecting shaft 52 by screw connection, and when the piston 53 moves to the end of the stroke close to the cylinder bottom 4 during the operation of the hydraulic cylinder, the end face of the large end of the piston 53 abuts against the end face of the first boss 33; the limiting sleeve 54 includes a large end and a small end, and at least one hole is radially opened at the large end of the limiting sleeve 54. In the first embodiment, the hole at the large end of the limiting sleeve 54 is a through hole; the limiting sleeve 54 is located on the side of the piston 53 close to the guide sleeve 55, and the large end of the limiting sleeve 54 is in contact with the small end of the piston 53, and the small end of the limiting sleeve 54 is in contact with the piston shaft 51.

[0032] The inner side surface of the end of the cylinder 1 away from the connection mechanism 3 has an annular groove 11, and the guide sleeve 55 has an outer convex ring 551 connected to the annular groove 15, and a flange 552 abutting against the end surface of the cylinder 1 away from the connection mechanism 12. The surfaces of the annular groove 15 and the outer convex ring 551 are both processed with threads, and the annular groove 15 is threadedly connected to the outer convex ring 551, and multiple sealing rings are arranged between the annular groove 15 and the outer convex ring 551. The guide sleeve 55 is located inside the cylinder 1 and has multiple sealing grooves on its surface that matches the inner surface of the cylinder 1.

[0033] The connecting shaft 52 comprises a first shaft section 521, a second shaft section 522 and a third shaft section 523. The first shaft section 521 is fitted with the inner side surface of the large end of the piston 53, the second shaft section 522 is fitted with the inner side surface of the large end of the limiting sleeve 54, and the third shaft section 523 is fitted with the inner side surface of the small end of the piston 53 and the inner side surface of the large end of the limiting sleeve 54, and the radial dimensions of the first shaft section 521, the second shaft section 522 and the third shaft section 523 are increased in sequence; at least one hole is provided on the side surface of the first shaft section 521, and at least one hole is provided on the side surface of the second shaft section 522. In the first embodiment, the first shaft section 521 is provided with a blind hole with a thread for connecting with the piston 53, and the second shaft section 522 is provided with a countersunk through hole from the outer surface to the inner side surface for connecting with the limiting sleeve 54, and a plurality of sealing grooves are provided on the outer surface of the second shaft section 522 between the first shaft section 521 and the through hole. The piston shaft 51 is welded to the connecting shaft 52. During assembly, the step from the inner side of the large end of the limiting sleeve 54 transitions to the inner side of the small end and abuts against the step from the second shaft section 522 to the third shaft section 523 of the connecting shaft 52, and the through hole on the large end of the limiting sleeve 54 is aligned with the through hole of the third shaft section 523 of the connecting shaft 52, and connected with a positioning pin. The step from the inner side of the large end of the piston 53 transitions to the inner side of the small end and abuts against the step from the first shaft section 521 to the second shaft section 522 of the connecting shaft 52, and the threaded hole of the piston 53 is aligned with the threaded hole of the first shaft section 521 of the connecting shaft 52, and the two are connected with screws. When the piston 53 moves to the bottom of the cylinder 1, the end face of the first boss 32 abuts against the end face of the piston 53 away from the guide sleeve 55, and the end face of the first boss 32 is surface-processed so that it can cooperate with the piston 53. The cooperation between the small end of the limiting sleeve 54 and the guide sleeve 55 in the axial direction can limit the stroke of the hydraulic cylinder. The axial size of the small end of the limiting sleeve 54 can be adjusted according to the actual required stroke.

[0034] Embodiment 2

[0035] like Figure 4 As shown, a hydraulic cylinder with a secondary cylinder includes a cylinder 1, a guide sleeve 55 connected to one end of the cylinder 1, a piston rod 11 inserted in the guide sleeve 55, a piston 53 disposed in the cylinder 1 and connected to the end of the piston rod 11 located in the cylinder 1, a connecting shaft 52 disposed at the end of the piston rod 11 located in the cylinder 1, a limiting sleeve 54 sleeved on the piston rod 11, and a cylinder bottom 4 disposed at one end of the hydraulic cylinder away from the guide sleeve 55. It is characterized in that the hydraulic cylinder also includes a connecting mechanism 3 and a secondary cylinder 2 that are connected to each other, and the connecting mechanism 3 is connected to the cylinder 1, and the secondary cylinder 2 is connected to the cylinder bottom 4. The technical features that distinguish it from the first embodiment are: the connecting mechanism 3 is detachably connected to the secondary cylinder 2, and the secondary cylinder 2 is detachably connected to the cylinder bottom 4. As shown in FIG. Figure 5 and Figure 6As shown, in the second embodiment, the outer surfaces of the second boss 33 and the third boss 42 that cooperate with the cylinder barrel 2 are processed with threads, and the inner surfaces of both ends of the cylinder barrel 2 are processed with threads. The second boss 33 is detachably connected to the auxiliary cylinder barrel 2, and the third boss 42 is detachably connected to the cylinder barrel 1. The detachable assembly through threaded connection allows the hydraulic cylinder with the auxiliary cylinder to be easily dismantled and replaced when the auxiliary cylinder barrel 2 needs to be changed, thereby improving the flexibility of the hydraulic cylinder with the auxiliary cylinder in various usage scenarios.

[0036] At the same time, the detachable assembly of the auxiliary cylinder 2 can limit the stroke range of the hydraulic cylinder. In a certain use scenario, the overall axial dimensions of the cylinder barrel 1, the connecting mechanism 3 and the auxiliary cylinder 2 of the hydraulic cylinder remain unchanged. By changing the position of the connecting mechanism 3 on the hydraulic cylinder as a whole, the axial length of the cylinder body 1 can be changed, thereby limiting the stroke within a certain range. Furthermore, by changing the axial dimension of the small end of the limiting sleeve 54, the stroke of the hydraulic cylinder is further limited. The detachable assembly of the auxiliary cylinder 2 can also change the maximum allowable length of the hydraulic cylinder. In a certain use scenario, the axial dimension of the cylinder barrel 1 of the hydraulic cylinder remains unchanged, and the axial dimension of the connecting mechanism main body 31 remains unchanged. By changing the axial dimension of the auxiliary cylinder 2, the maximum allowable length of the hydraulic cylinder as a whole can be changed, and further changing the axial dimension of the small end of the limiting sleeve 54 can further limit the stroke of the hydraulic cylinder, thereby realizing the flexibility and practicality of the hydraulic cylinder.

[0037] Embodiment 3

[0038] This embodiment describes the actual operation process of the hydraulic cylinder with a secondary cylinder: Figure 1 or Figure 2 As shown, according to the actual use scenario, a sub-cylinder barrel 2 of appropriate size is installed for the hydraulic cylinder, the hinge holes at both ends of the hydraulic cylinder are hinged to the connection parts of the installation equipment, the hinge end connected to the piston shaft 51 is connected to the active part of the equipment, and the hinge end provided at the cylinder bottom 4 is connected to the fixed end of the equipment. The oil enters the space between the connecting mechanism 3 and the piston 53 in the cylinder barrel 1, and the space between the limit sleeve 54 and the guide sleeve 51 in the cylinder barrel 1 (the oil inlet is respectively provided on the connecting mechanism 2 and the cylinder barrel 1, which are not marked in the figure, and this embodiment only describes the movement state of the hydraulic cylinder). When the oil between the connecting mechanism 3 and the piston 53 increases, the oil pushes the connecting shaft 52 and the piston 53, and the connecting shaft 52 drives the piston shaft 51 and the hinge end connected to the piston shaft 51 to realize the stroke pushed by the hydraulic cylinder. When the small end of the limit sleeve 54 abuts against the guide sleeve 55, the hydraulic cylinder reaches the maximum size of the allowable stroke. When the oil between the limit sleeve 54 and the guide sleeve 55 increases, the limit sleeve 54 pushes the connecting shaft 52, and the connecting shaft 52 drives the piston shaft 51 and the hinged end connected to the piston shaft 51 to realize the retraction stroke of the hydraulic cylinder. When the piston 53 abuts against the first boss 32 of the connecting mechanism 3, the hydraulic cylinder reaches the minimum allowable stroke size.

[0039] In summary, the utility model overcomes various shortcomings in the prior art and produces beneficial effects: (1) The auxiliary cylinder in the utility model can effectively limit the stroke range of the hydraulic cylinder and replace the excessive axial dimension of the hydraulic cylinder barrel; (2) At the same time, the production and manufacturing of the auxiliary cylinder is relatively simple, which reduces the cost of the hydraulic cylinder barrel in the manufacturing process; (3) Compared with the technical solution of limiting by a limiting sleeve in the prior art, the utility model can make the hydraulic cylinder more stable and safe when working. The above embodiments are only illustrative of the principle and effect of the utility model, and are not used to limit the utility model.

Claims

1. A hydraulic cylinder with a secondary cylinder barrel, comprising a hydraulic cylinder body, characterized in that: The hydraulic cylinder body includes a cylinder barrel, a piston mechanism partially placed in the cylinder barrel, and a cylinder bottom placed at one end of the hydraulic cylinder body away from the piston mechanism. The hydraulic cylinder body also includes a connecting mechanism and a secondary cylinder barrel that are connected to each other, and the connecting mechanism is connected to the cylinder barrel, and the secondary cylinder barrel is connected to the cylinder bottom.

2. The hydraulic cylinder with a secondary cylinder according to claim 1, characterized in that: The connecting mechanism includes a main body, the main body has a first end face and a second end face, the cylinder bottom has a third end face, the first end face and the second end face are respectively provided with a first boss and a second boss, the third end face is provided with a third boss, the portion provided on the first end face and located between the first boss and the outer side surface of the main body is a first supporting surface, the portion provided on the second end face and located between the second boss and the outer side surface of the main body is a second supporting surface, the portion on the third end face located between the outer side surface of the third boss and the outer side surface of the cylinder bottom is a third supporting surface, and the first boss cooperates with the cylinder barrel, the second boss and the third boss cooperate with the auxiliary cylinder barrel, the first supporting surface is in contact with the cylinder barrel, and the second supporting surface and the third supporting surface are in contact with the auxiliary cylinder barrel.

3. The hydraulic cylinder with a secondary cylinder according to claim 2, characterized in that: The first supporting surface and the end surface of the cylinder away from the guide sleeve are fitted to form a first connecting seam, and the connecting mechanism is fixedly connected to the cylinder.

4. The hydraulic cylinder with auxiliary cylinder according to claim 3, characterized in that: The second supporting surface and the auxiliary cylinder are fitted to form a second connection seam, the third supporting surface and the auxiliary cylinder are fitted to form a third connection seam, and the auxiliary cylinder is fixedly connected to the connection mechanism and the cylinder bottom respectively.

5. The hydraulic cylinder with a secondary cylinder according to claim 3, characterized in that: The second boss is connected to the auxiliary cylinder, and the third boss is connected to the auxiliary cylinder.

6. The hydraulic cylinder with a secondary cylinder according to any one of claims 3, 4 or 5, characterized in that: The piston mechanism includes a guide sleeve connected to one end of the cylinder, a piston rod inserted into the guide sleeve, a piston placed in the cylinder and connected to the part of the piston rod located in the cylinder, a connecting shaft provided on the part of the piston rod located in the cylinder, and a limiting sleeve sleeved on the piston rod.

7. The hydraulic cylinder with a secondary cylinder according to claim 6, characterized in that: The piston comprises a large end and a small end, and at least one hole is radially opened on the large end of the piston; the limiting sleeve comprises a large end and a small end, and at least one hole is radially opened on the large end of the limiting sleeve; the limiting sleeve is located on the side of the piston close to the guide sleeve, and the large end of the limiting sleeve is in contact with the small end of the piston, and the small end of the limiting sleeve is in contact with the piston shaft.

8. The hydraulic cylinder with a secondary cylinder according to claim 6, characterized in that: The inner side surface of one end of the cylinder away from the connecting mechanism is provided with an annular groove, and the guide sleeve is provided with an outer convex ring connected with the annular groove and a flange abutting against the end surface of the cylinder away from the connecting mechanism.

9. The hydraulic cylinder with a secondary cylinder according to claim 6, characterized in that: The connecting shaft includes a first shaft section that fits with the inner side surface of the big end of the piston, a third shaft section that fits with the inner side surface of the big end of the limiting sleeve and is connected to the piston shaft, and a second shaft section that fits with both the inner side surface of the small end of the piston and the inner side surface of the big end of the limiting sleeve, and the radial dimensions of the first shaft section, the second shaft section, and the third shaft section increase successively; at least one hole is opened on the side surface of the first shaft section of the connecting shaft, and at least one hole is opened on the side surface of the second shaft section of the connecting shaft.

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