Hydraulic cylinder and working machine

Abstract

The present application relates to the technical fields of hydraulic elements, and provides a hydraulic cylinder and a working machine. The hydraulic cylinder comprises a cylinder body, a piston, a piston rod and a primary buffer structure. The primary buffer structure comprises a guide piece, which is slidably arranged in the cylinder body and slidably sleeved on the piston rod. The end of the guide piece close to the piston can abut against the piston. The guide piece is provided with a buffer inclined surface, which gradually inclines towards the direction close to the piston rod from the end close to the piston to the end away from the piston. A sliding block is slidably connected with the cylinder body along the radial direction of the cylinder body, and abuts against the buffer inclined surface. A first elastic piece is connected with the cylinder body and the sliding block respectively, and is used to drive the sliding block towards the direction close to the guide piece. Under the action of the primary buffer structure, the sliding block provides resistance for the guide piece, so as to slow down the speed of the piston, and further avoid the piston from colliding with the cylinder body to generate vibration and noise, so as to prevent the hydraulic cylinder from being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic components, and in particular to a hydraulic cylinder and an operating machine. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. When the piston moves to the end of the cylinder stroke along with the piston rod, the piston may collide with the cover, causing the hydraulic cylinder to produce loud noise and vibration, leading to damage to the hydraulic cylinder.

[0003] Therefore, how to solve the problem that the piston easily collides with the cylinder head is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0004] The present invention provides a hydraulic cylinder and an operating machine, which are used to solve the defect in the prior art that a piston easily collides with a cylinder cover, and achieve the effect of buffering the piston and preventing the piston from colliding with the cylinder cover.

[0005] The present invention provides a hydraulic cylinder, comprising a cylinder body, a piston, a piston rod and a primary buffer structure; the primary buffer structure comprises:

[0006] A guide member is slidably disposed on the cylinder body and slidably fitted on the piston rod, wherein an end of the guide member close to the piston can abut against the piston, and the guide member is provided with a buffer slope, and the buffer slope gradually tilts toward the direction close to the piston rod from the end of the piston rod close to the piston to the end away from the piston;

[0007] a slider slidably connected to the cylinder body along a radial direction of the cylinder body, and the slider abuts against the buffer slope;

[0008] The first elastic member is connected to the cylinder body and the slider respectively, and the first elastic member is used to drive the slider toward the direction close to the guide member.

[0009] A hydraulic cylinder provided according to the present invention further includes a secondary buffer structure, wherein the secondary buffer structure includes a second elastic member;

[0010] The second elastic member is arranged in the cylinder body, and the first end of the second elastic member is connected to the cylinder body, the second end of the second elastic member can be against the guide member, and the second elastic member is used to drive the guide member toward one end of the guide member close to the piston.

[0011] A hydraulic cylinder provided according to the present invention further includes a sliding member and a positioning structure;

[0012] The sliding member is sleeved between the guide member and the piston rod, and is slidably matched with the guide member and the piston rod respectively;

[0013] The positioning structure is connected to the end of the guide member close to the piston, and the positioning structure is sleeved on the piston rod with a gap therebetween. The positioning structure and the end of the sliding member close to the piston can switch between abutting and spacing states.

[0014] According to a hydraulic cylinder provided by the present invention, an annular flange is provided on the outer circumferential surface of one end of the sliding member close to the piston, and the guide member is provided with an annular groove for the annular flange to be placed in.

[0015] According to a hydraulic cylinder provided by the present invention, the annular flange is provided with a pressure relief hole provided through the axial direction of the sliding member;

[0016] The pressure relief hole is arranged opposite to the gap between the sliding member and the guide member.

[0017] A hydraulic cylinder provided according to the present invention further includes a second elastic member;

[0018] The second elastic member is arranged in the cylinder body, and the first end of the second elastic member is connected to the cylinder body, the second end of the second elastic member can be connected to the guide member, and the second elastic member is used to drive the guide member toward one end of the guide member close to the piston.

[0019] According to a hydraulic cylinder provided by the present invention, the guide member includes a guide sleeve sleeved on the piston rod and a slip ring sleeved on the guide sleeve, and the buffer slope is provided on the slip ring;

[0020] The guide sleeve is provided with a shaft shoulder, and the shaft shoulder abuts against an end of the sliding ring close to the piston.

[0021] According to the present invention, a hydraulic cylinder further comprises a guide rod connected to the cylinder body, wherein the first elastic member and the sliding block are both mounted on the guide rod;

[0022] The slip ring is provided with a wedge block, the inclined surface of the wedge block is set as the buffer inclined surface, and the wedge block is provided with a sliding groove for the guide rod to extend into, and the sliding groove extends along the axial direction of the piston rod.

[0023] According to the hydraulic cylinder provided by the present invention, sliding sealing structures are provided between the sliding member and the piston rod, between the sliding member and the guide member, and between the guide member and the cylinder body.

[0024] According to a hydraulic cylinder provided by the present invention, the positioning structure includes a buffer pad and a fixing sleeve, the fixing sleeve is threadedly engaged with the guide member, the buffer pad is arranged between the fixing sleeve and the sliding member, and the buffer pad is connected to the fixing sleeve;

[0025] And / or, the sliding member includes a free piston and a spacer sleeve, the free piston is arranged at one end close to the piston, and the spacer sleeve is arranged at one end away from the piston.

[0026] The present invention also provides a working machine comprising the hydraulic cylinder described above.

[0027] The hydraulic cylinder provided by the present invention utilizes a primary buffer structure. As the piston rod extends, the piston contacts the guide member, driving the guide member to move synchronously. During the guide member's movement, the guide member's buffer slope interacts with the slider, driving the slider away from the piston rod and compressing the first elastic member. Under the action of the first elastic member, the slider provides resistance to the guide member, slowing the piston's movement. This prevents vibration and noise caused by collision between the piston and the cylinder body, thus preventing damage to the hydraulic cylinder and extending its service life.

[0028] Specifically, the operating machine provided by the present invention includes the above-mentioned hydraulic cylinder, and therefore also includes all the above-mentioned advantages of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 is a schematic structural diagram of a hydraulic cylinder provided in some embodiments of the present invention;

[0031] Figure 2 yes Figure 1 Partial enlarged view of Ⅰ;

[0032] Figure 3 yes Figure 2 Partial enlarged view of Ⅱ;

[0033] Figure 4 Schematic diagram of the installation state of the slider and the first elastic member provided in some embodiments of the present invention

[0034] Figure 5 Schematic diagram of the arrangement of slip rings and wedge blocks provided in some embodiments of the present invention.

[0035] Reference numerals:

[0036] 1. Cylinder; 2. Connecting part; 3. End cover; 4. Pressure cover; 5. Piston; 6. Piston rod; 7. Buffer slope; 8. Slider; 9. First elastic part; 10. Annular flange; 11. Annular groove; 12. Pressure relief hole; 13. Second elastic part; 14. Guide sleeve; 15. Slip ring; 16. Shoulder; 17. Guide rod; 18. Wedge block; 19. Buffer pad; 20. Fixed sleeve; 21. Free piston; 22. Spacer; 23. Buffer ring; 24. Wire sleeve; 25. Slide groove; 26. Limit sleeve; 27. Hole shoulder. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0038] The following combination Figures 1 to 5 A hydraulic cylinder provided in an embodiment of the present invention will be described.

[0039] Specifically, the hydraulic cylinder includes a cylinder body, a piston 5, a piston rod 6 and a primary buffer structure. The primary buffer structure includes a guide member, a slider 8 and a first elastic member 9.

[0040] Optionally, the cylinder body may include a cylinder barrel 1 , a connecting piece 2 , an end cover 3 and a pressure cover 4 .

[0041] refer to Figure 1 As shown, the cylinder 1, the connector 2, the end cover 3 and the gland 4 are connected in sequence from top to bottom, and any two adjacent ones can be connected by threaded fasteners.

[0042] Furthermore, the oil port of the rod cavity can be provided on the connecting member 2 .

[0043] The piston 5 is slidably disposed in the cylinder body. Specifically, the piston 5 is slidably disposed in the cylinder barrel 1. A sliding sealing structure is provided between the piston 5 and the cylinder barrel 1.

[0044] The first end of the piston rod 6 is connected to the piston 5, and the second end of the piston rod 6 extends from the cylinder body. Specifically, the second end of the piston rod 6 passes through the connecting member 2, the end cover 3 and the pressure cover 4 in sequence and extends out.

[0045] The guide member is slidably disposed within the cylinder body and slidably fits over the exterior of the piston rod 6. The end of the guide member proximate to the piston 5 is capable of abutting against the piston 5. The guide member is provided with a buffer slope 7, which gradually slopes toward the piston rod 6 from the end proximate to the piston to the end distal to the piston.

[0046] The slider 8 is slidably connected to the cylinder body along the radial direction of the cylinder body, and the slider 8 abuts against the buffer slope 7.

[0047] Optionally, the end cap 3 is provided with a hole shoulder 27 and a limiting sleeve 26, wherein a gap is formed between the limiting sleeve 26 and the hole shoulder 27, and the slider 8 is slidably disposed between the hole shoulder 27 and the limiting sleeve 26. Furthermore, one end of the limiting sleeve 26 abuts against the connector 2, and the other end abuts against a raised structure on the inner wall of the end cap 3, that is, the limiting sleeve 26 is compressed and fixed by the end cap 3 and the connector 2, so that a space is formed between the limiting sleeve 26 and the hole shoulder 27 for the slider 8 to slide.

[0048] The first elastic member 9 is connected to the cylinder body and the slider 8 respectively, and the first elastic member 9 is used to drive the slider 8 toward the direction close to the guide member. For example, the first elastic member 9 can be set as a spring.

[0049] refer to Figure 1 As shown, the hydraulic cylinder provided in an embodiment of the present invention employs a first-stage buffer structure. As the piston rod 6 extends, the piston 5 contacts the guide member, driving the guide member to move synchronously. During the guide member's movement, the guide member's buffer ramp 7 interacts with the slider 8, driving the slider 8 away from the piston rod 6 and compressing the first elastic member 9. Under the action of the first elastic member 9, the slider 8 provides resistance to the guide member, thereby slowing the piston 5 and preventing vibration and noise caused by collision between the piston 5 and the cylinder body. This prevents damage to the hydraulic cylinder and extends its service life.

[0050] Furthermore, the angle between the buffer slope 7 and the extension direction of the piston rod 6 is less than 45°. With this arrangement, when the piston 5 abuts the guide member and the piston 5 travels a unit length, the slider 8 travels a distance less than the unit length, and the corresponding spring compression is less than the unit length. This provides flexible buffering for the piston 5, preventing excessive buffering from causing the piston 5 to stop suddenly, thereby negating its buffering function. It also prevents noise issues caused by hydraulic shock from a sudden stop.

[0051] refer to Figure 4 、 Figure 5 As shown, further, the slider 8 and the first elastic member 9 are both provided in plurality, and the two correspond to each other one by one. The plurality of sliders 8 are evenly distributed along the circumference of the guide member.

[0052] Such an arrangement can improve the buffering and deceleration effect on the piston 5 and make the piston 5 evenly stressed.

[0053] refer to Figure 1 As shown, in some embodiments provided by the present invention, the outer surface of the guide member is provided with a shaft shoulder 16. The cylinder body is provided with a positioning surface for abutting against the shaft shoulder 16 at the end near the piston 5. For example, the positioning surface can be set as the end surface of the connector 2 at the end near the end cap 3.

[0054] With such an arrangement, when the piston rod 6 retracts with the piston 5, the guide member is reset under the drive of the slider 8 and abuts against the positioning surface. By abutting against the connecting member 2, the problem of the buffer slope 7 and the slider 8 being separated from each other due to the guide member continuing to move with the piston rod 6 can be avoided.

[0055] refer to Figure 1 As shown, in some embodiments provided by the present invention, the guide member includes a guide sleeve 14 sleeved on the piston rod 6 and a slip ring 15 sleeved on the guide sleeve 14, and the buffer slope 7 is provided on the slider 8. The guide sleeve 14 can abut against the piston 5.

[0056] The shaft shoulder 16 is provided on the guide sleeve 14 , and one end of the slip ring 15 close to the piston 5 abuts against the shaft shoulder 16 .

[0057] The guide sleeve 14 guides the piston rod 6. As the piston rod 6 extends, the piston 5 contacts and pushes the guide sleeve 14, which in turn pushes the guide sleeve 14. The guide sleeve 14's shoulder 16 pushes the slip ring 15, causing the slip ring 15's buffer slope 7 to drive the slider 8 to compress the first elastic member 9. When the piston rod 6 retracts, the first elastic member 9 recovers its deformation and drives the slider 8 to move. The slider 8 pushes the slip ring 15, which in turn pushes the shoulder 16 until it contacts the connector 2.

[0058] With this arrangement, when the buffer slope 7 is worn or damaged, only the slip ring 15 can be replaced without replacing the guide sleeve 14. Similarly, when the guide sleeve 14 is worn or damaged, only the guide sleeve 14 can be replaced without replacing the slip ring 15. In this way, the maintenance cost of the hydraulic cylinder can be reduced.

[0059] Furthermore, in order to better connect the slip ring 15 with the guide sleeve 14, the slip ring can be reliably and accurately reset. Figure 3 As shown, the hydraulic cylinder further includes a wire sleeve 24, which is sleeved on the guide sleeve 14 and abuts against the end of the slip ring 15 away from the piston 5. Through the combined action of the wire sleeve 24 and the shaft shoulder 16, the slip ring 15 can always be displaced synchronously with the guide sleeve 14.

[0060] In some embodiments provided by the present invention, the hydraulic cylinder further includes a secondary buffer structure, and the secondary buffer structure includes a second elastic member 13 .

[0061] The second elastic member 13 is arranged in the cylinder body, and a first end of the second elastic member 13 is connected with the cylinder body, and a second end of the second elastic member 13 is capable of abutting against the guide member, and the second elastic member 13 is used for driving the guide member to the end of the guide member close to the piston 5.

[0062] Thus, in the process of the piston rod extending, after the piston 5 pushes the guide member to be connected with the second elastic member 13, the piston 5 can be buffered simultaneously under the joint action of the primary buffering structure and the secondary buffering structure, and a greater impact force can be effectively borne to stop the movement of the piston 5.

[0063] Reference Figure 1 As shown in some embodiments provided by the present application, the hydraulic cylinder further comprises a sliding member and a positioning structure.

[0064] The sliding member is sleeved between the guide member and the piston rod 6, and is in sliding fit with the guide member and the piston rod 6 respectively. Specifically, the sliding member is sleeved between the guide sleeve 14 and the piston rod 6, and the guide sleeve 14 guides the piston rod 6 through the sliding member.

[0065] The positioning structure is connected with the end of the guide member close to the piston 5. For example, the positioning structure is connected with the end of the guide sleeve 14 close to the piston 5. The positioning structure is sleeved on the piston rod 6, and has a gap between the positioning structure and the piston rod 6. The end of the positioning structure close to the piston 5 is capable of switching between an abutting state and a spaced state.

[0066] Reference Figure 1 As shown, the working principle includes: in the process of the piston rod 6 extending, when the piston 5 is not abutted against the guide sleeve 14, the high-pressure hydraulic oil in the rod cavity enters from the gap between the positioning structure and the piston rod 6 to the gap between the positioning structure and the sliding member, at this time, the sliding member can be abutted against the gland 4 of the cylinder body or the second elastic member 13 under the drive of the hydraulic oil, and the sliding member and the positioning structure are in the spaced state.

[0067] When the piston 5 is abutted against the guide sleeve 14, the positioning structure moves to the direction close to the sliding member, so that the spacing distance between the sliding member and the positioning structure is reduced, at this time, the hydraulic oil between the sliding member and the positioning structure is extruded to enter from the gap between the positioning structure and the piston rod 6 to the rod cavity, and the hydraulic oil acting on the piston 5 can buffer the piston 5.

[0068] When the positioning structure moves to the spacing distance between the positioning structure and the sliding member being zero, the positioning structure and the sliding member are in the abutting state, at this time, since the end of the sliding member away from the piston 5 is abutted against the cylinder body or the second elastic member 13, the positioning structure stops under the limitation of the sliding member, and at the same time, the piston 5 stops.

[0069] This arrangement allows the hydraulic oil between the positioning structure and the sliding member to act as a flexible buffer for the piston 5. This effectively prevents the problem of excessive impact between the various structures caused by the slider 8 and the buffer ramp 7 responding too quickly when the piston 5 has excessive momentum, thereby causing damage to the structure. It also prevents excessive buffering generated by the interaction between the slider 8 and the buffer ramp 7, which could cause the piston 5 to stop suddenly, resulting in a rigid impact within the cylinder 1 and rendering the cylinder ineffective in its buffering function.

[0070] Furthermore, when the positioning structure and the sliding member are in contact with each other, the end of the sliding member away from the piston protrudes beyond the end of the guide member away from the piston. This allows the positioning structure and the sliding member to contact each other during the extension of the piston rod, thereby completely draining the hydraulic oil between the positioning structure and the sliding member, thereby providing a better cushioning effect on the piston.

[0071] It should be noted that the reference Figure 1 As shown, for a hydraulic cylinder provided with a secondary buffer structure, the sliding member can be offset against the secondary buffer structure, that is, in this case, the guide member is offset against the second elastic member 13 via the sliding member. For a hydraulic cylinder not provided with a secondary buffer structure, the sliding member can be offset against the cylinder body, that is, the guide member is offset against the cylinder body via the sliding member.

[0072] Optionally, the second elastic member 13 is configured as a disc spring.

[0073] Furthermore, the gland 4 is provided with a mounting groove for mounting a butterfly spring.

[0074] In some embodiments provided by the present invention, the positioning structure includes a buffer pad 19 and a fixing sleeve 20 .

[0075] The fixing sleeve 20 is threadedly engaged with the guide member. For example, the end of the guide sleeve 14 near the piston 5 is provided with an internal thread, and the outer wall of the fixing sleeve 20 is provided with an external thread that matches the internal thread. The fixing sleeve 20 is screwed into the inner part of the end of the guide sleeve 14 near the piston 5.

[0076] The buffer pad 19 is disposed between the fixing sleeve 20 and the sliding member, and the buffer pad 19 is connected to the fixing sleeve 20. For example, the buffer pad 19 can be connected to the fixing sleeve 20 by a threaded fastener.

[0077] Since the positioning structure needs to frequently conflict with the sliding part, the force conditions are relatively complicated. By setting the positioning structure as a buffer pad 19 and a fixed sleeve 20, the buffer pad 19 is used as the part that cooperates with the sliding part, and the fixed sleeve 20 is used as the part that is connected to the guide part. On the one hand, different materials can be used for the buffer pad 19 and the fixed sleeve 20 in a targeted manner to better meet the use requirements. On the other hand, it is convenient to replace easily damaged parts in a targeted manner without replacing all parts.

[0078] Referring to Figure 1 , Figure 2 As shown in FIG. 1, in some embodiments provided by the present application, the outer circumferential surface of the one end of the sliding member close to the piston 5 is provided with an annular flange 10, and the guide member is provided with an annular groove 11 for placing the annular flange 10.

[0079] By providing the annular flange 10, the contact area between the sliding member and the positioning structure can be increased, so as to improve the stress condition between the positioning structure and the annular flange 10, and further reduce the damage of the positioning structure and the annular flange 10.

[0080] Referring to Figure 1 , Figure 2 As shown in FIG. 1, in some embodiments provided by the present application, the annular flange 10 is provided with a pressure relief hole 12 penetrating through the axial direction of the sliding member.

[0081] The pressure relief hole 12 is arranged opposite to the gap between the sliding member and the guide member.

[0082] By providing the pressure relief hole 12, on the one hand, during the extension of the piston rod 6, the hydraulic oil between the annular flange 10 and the side wall of the annular groove 11 can be quickly discharged from the pressure relief hole 12, so as to avoid the hydraulic oil between the annular flange 10 and the side wall of the annular groove 11 from hindering the movement of the sliding member. On the other hand, when the annular flange 10 abuts against the side wall of the annular groove 11, the hydraulic oil in the gap between the sliding member and the guide member can be discharged from the pressure relief hole 12, so as to avoid the problem that the annular flange 10 and the side wall of the annular groove 11 abut against each other quickly, and the high pressure is formed in the gap between the sliding member and the guide member instantaneously, which causes the sealing structure between the sliding member and the guide member to be broken.

[0083] Referring to Figure 1 As shown in FIG. 1, in some embodiments provided by the present application, the hydraulic cylinder further comprises a buffer ring 23. The buffer ring 23 is connected to the one end of the positioning structure close to the piston 5. That is, the positioning structure abuts against the piston 5 through the buffer ring 23.

[0084] For example, the buffer ring 23 can be connected to the guide sleeve 14 through a threaded fastener, and the buffer ring 23 abuts against the fixed sleeve 20. The buffer ring 23 has a gap with the piston rod 6.

[0085] Referring to Figure 1As shown, by providing the buffer ring 23, on the one hand, it is easier for the guide member to abut against the piston 5 through the buffer ring 23. On the other hand, after the buffer ring 23 is provided, when the guide sleeve 14 is squeezed, the hydraulic oil between the sliding member and the positioning structure needs to pass through the gap between the positioning structure and the piston rod 6 and the gap between the buffer ring 23 and the piston rod 6 in sequence before entering the rod cavity. This extends the running path of the hydraulic oil and increases the discharge resistance of the hydraulic oil between the positioning structure and the sliding member, thereby improving the buffering effect on the piston 5.

[0086] refer to Figure 1 、 Figure 3 and Figure 4 As shown, in some embodiments provided by the present invention, the hydraulic cylinder further includes a guide rod 17 connected to the cylinder body. The first elastic member 9 and the slider 8 are both mounted on the guide rod 17. By mounting the first elastic member 9 and the slider 8 on the guide rod 17, the first elastic member 9 and the slider 8 are prevented from shifting or moving.

[0087] The slip ring 15 is provided with a wedge block 18, the inclined surface of which is configured as a buffer slope 7. The wedge block 18 is provided with a chute 25 for the guide rod 17 to extend into, and the chute 25 extends along the axial direction of the piston rod 6. The guide rod 17 extending into the chute 25 can prevent the slip ring 15 from rotating around the guide member, which may cause the wedge block 18 and the slider 8 to be misaligned.

[0088] Furthermore, the number of the wedge blocks 18 is set to be multiple and corresponds one to one with the sliders 8 .

[0089] refer to Figure 1 As shown, in some embodiments provided by the present invention, sliding seal structures are provided between the sliding member and the piston rod 6, between the sliding member and the guide member, and between the guide member and the cylinder body. The provision of sliding seal structures can prevent the hydraulic oil in the rod cavity from leaking through any of these three locations, thereby improving the sealing effect of the hydraulic cylinder.

[0090] refer to Figure 1 As shown, in some embodiments provided by the present invention, the sliding member includes a free piston 21 and a spacer sleeve 22. The free piston 21 is arranged at one end close to the piston. For example, the free piston 21 is used to abut against the positioning structure. The spacer sleeve 22 is arranged at one end away from the piston. For example, the spacer sleeve 22 is used to abut against the cylinder body. For example, the free piston 21 and the piston rod 6 are set to a matching size, and the sliding sealing structure is provided between the free piston 21 and the piston rod 6. The spacer sleeve 22 may not be set to a matching size with the piston rod 6. For example, there is a gap between the spacer sleeve 22 and the piston rod 6, and the spacer sleeve 22 is only used for force transmission.

[0091] This arrangement only requires improving the machining accuracy of the free piston 21, while relaxing the machining accuracy requirements for the spacer sleeve 22. This reduces the machining difficulty and cost of the sliding components. Furthermore, if the free piston 21 or spacer sleeve 22 becomes damaged, the damaged component can be replaced without replacing the entire sliding component.

[0092] The present invention also provides a working machine.

[0093] Specifically, the working machine includes the hydraulic cylinder described above.

[0094] It should be noted that the operating machinery includes a hydraulic cylinder and also includes all the advantages of the hydraulic cylinder, which will not be elaborated here.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic cylinder, characterized in that: It includes a cylinder body, a piston, a piston rod, a primary buffer structure, a sliding part and a positioning structure; The primary buffer structure includes: A guide member is slidably disposed on the cylinder body and slidably fitted on the piston rod, wherein an end of the guide member close to the piston can abut against the piston, and the guide member is provided with a buffer slope, and the buffer slope gradually tilts toward the direction close to the piston rod from the end of the piston rod close to the piston to the end away from the piston; a slider slidably connected to the cylinder body along a radial direction of the cylinder body, and the slider abuts against the buffer slope; a first elastic member, connected to the cylinder and the slider, respectively, and configured to drive the slider toward the guide member; The sliding member is sleeved between the guide member and the piston rod, and is slidably matched with the guide member and the piston rod respectively; The positioning structure is connected to the end of the guide member close to the piston, and the positioning structure is sleeved on the piston rod with a gap therebetween. The positioning structure and the end of the sliding member close to the piston can switch between abutting and spacing states.

2. The hydraulic cylinder according to claim 1, characterized in that Also included is a secondary buffer structure, the secondary buffer structure including a second elastic member; The second elastic member is arranged in the cylinder body, and the first end of the second elastic member is connected to the cylinder body, the second end of the second elastic member can be against the guide member, and the second elastic member is used to drive the guide member toward one end of the guide member close to the piston.

3. The hydraulic cylinder according to claim 1, characterized in that An annular flange is provided on the outer circumferential surface of one end of the sliding member close to the piston, and an annular groove is provided on the guide member for the annular flange to be placed in.

4. The hydraulic cylinder according to claim 3, characterized in that The annular flange is provided with a pressure relief hole extending through the axial direction of the sliding member; The pressure relief hole is arranged opposite to the gap between the sliding member and the guide member.

5. The hydraulic cylinder according to claim 1, wherein: The guide member includes a guide sleeve sleeved on the piston rod and a slip ring sleeved on the guide sleeve, and the buffer slope is provided on the slip ring; The guide sleeve is provided with a shaft shoulder, and the shaft shoulder abuts against an end of the sliding ring close to the piston.

6. The hydraulic cylinder according to claim 5, characterized in that It also includes a guide rod connected to the cylinder body, and the first elastic member and the sliding block are both sleeved on the guide rod; The slip ring is provided with a wedge block, the inclined surface of the wedge block is set as the buffer inclined surface, and the wedge block is provided with a sliding groove for the guide rod to extend into, and the sliding groove extends along the axial direction of the piston rod.

7. The hydraulic cylinder according to claim 1, characterized in that Sliding sealing structures are provided between the sliding member and the piston rod, between the sliding member and the guide member, and between the guide member and the cylinder body.

8. The hydraulic cylinder according to claim 1, wherein: The positioning structure includes a buffer pad and a fixing sleeve, the fixing sleeve is threadedly engaged with the guide member, the buffer pad is arranged between the fixing sleeve and the sliding member, and the buffer pad is connected to the fixing sleeve; And / or, the sliding member includes a free piston and a spacer sleeve, the free piston is arranged at one end close to the piston, and the spacer sleeve is arranged at one end away from the piston.

9. A working machine, characterized in that: Comprising the hydraulic cylinder according to any one of claims 1 to 8.

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