Multistage hydraulic cylinder device capable of being adjusted in floating mode and forklift

Abstract

A multi-stage hydraulic cylinder device capable of being adjusted in a floating mode and a forklift truck comprise a cylinder barrel, a sleeve is arranged in the cylinder barrel, the sleeve is provided with a sealing piece, the sleeve, the cylinder barrel and the sealing piece form a first-stage piston hydraulic cylinder device, one end of the sleeve is sealed, a piston rod is arranged in the sleeve, the piston rod and the sleeve form a second-stage hydraulic cylinder device, and a first-stage rod cavity is communicated with a second-stage rodless cavity. And the tail part of the piston rod is connected with a rod body lug ring, and the rod body lug ring is connected with the shovel plate end. According to the multi-stage hydraulic cylinder device capable of being adjusted in a floating mode and the forklift, two stages of oil ways are arranged, isolation of the two stages of oil ways is achieved through the positioning plug, and the positioning function is provided when the second-stage rod body is fully retracted; by means of the two-stage plunger type oil way design, the rod body can be adjusted in a floating mode according to different external force; through the floating adjusting function, the requirement for operation on flat and bumpy ground can be met.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, in particular to a floating adjustable multi-stage hydraulic cylinder device and a forklift. Background Art

[0002] In the prior art, single-stage hydraulic cylinders are often used as control elements for controlling the angle of the shovel blade of construction machinery. However, when encountering complex terrain, the shovel blade cannot adjust its angle according to the terrain, causing the structural parts to collide and affect the user experience. At the same time, abnormal external forces will also affect the service life of the hydraulic cylinder. Therefore, a new hydraulic cylinder structure is needed that can ensure the shovel blade angle adjustment function while also having the function of rod floating adjustment, improve the reliability of the hydraulic cylinder, extend the service life of the product structural parts, and improve the customer experience. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a floating adjustable multi-stage hydraulic cylinder device and a forklift with a simple structure and good effect.

[0004] The present invention is implemented with the following technical scheme: a floating and adjustable multi-stage hydraulic cylinder device, comprising a cylinder barrel, a sleeve being arranged in the cylinder barrel, a sealing member being arranged on the outside of the front end of the sleeve and used in conjunction with the inner wall of the cylinder barrel, the sleeve, the cylinder barrel and the sealing member forming a first-stage piston hydraulic cylinder device, one end of the sleeve being sealed, a piston rod being arranged in the sleeve, the piston rod and the sleeve forming a second-stage hydraulic cylinder device, the first-stage rod chamber of the first-stage piston hydraulic cylinder device being communicated with the second-stage rodless chamber of the second-stage hydraulic cylinder device, the second-stage rodless chamber of the second-stage hydraulic cylinder device being communicated with the second-stage rod chamber, the tail end of the piston rod being connected with a rod body earring, and the rod body earring being connected with the shovel plate end.

[0005] It is further provided that: the interior of the front end of the sleeve is blocked and sealed by a positioning plug, the positioning plug and the sleeve are connected together by threads, and a positioning plug top screw for fixing the positioning plug is provided on the sleeve.

[0006] A sleeve guide sleeve is arranged between the tail of the sleeve and the cylinder, and the sleeve guide sleeve is fixed on the inner wall of the cylinder through threads.

[0007] The seal divides the first-stage piston hydraulic cylinder device into a first-stage rodless chamber and a first-stage rod chamber. The sleeve is provided with an oil hole I at the position of the first-stage rod chamber, and the oil hole I connects the first-stage rod chamber and the second-stage hydraulic cylinder.

[0008] The piston rod comprises a piston and a rod body, and the piston is fixed to the small head end of the rod body through a thread and a piston top screw.

[0009] The outer periphery of the piston is provided with a supporting ring seal which cooperates with the inner wall of the sleeve.

[0010] A rod body guide sleeve is arranged between the tail of the rod body and the sleeve, and the rod body guide sleeve is fixed on the inner wall of the sleeve through threads.

[0011] The piston is provided with an oil hole II, the oil hole II communicates with the secondary rod chamber and the secondary rodless chamber, and the sleeve, the piston rod and the oil hole II form a plunger type oil circuit structure.

[0012] A forklift comprises the above-mentioned floating adjustable multi-stage hydraulic cylinder device.

[0013] The invention further comprises the following steps: during installation, the cylinder body earrings of the multi-stage hydraulic cylinder are connected with the vehicle body, and the rod body earrings of the multi-stage hydraulic cylinder are connected with the shovel plate.

[0014] The present invention has the following advantages: a floatingly adjustable multi-stage hydraulic cylinder device and a forklift of the present invention are provided with two-stage oil circuits, the two-stage oil circuits are isolated by a positioning plug, and a positioning function is provided when the secondary rod body is fully retracted; through the secondary plunger oil circuit design, the rod body can be floated and adjusted according to different external forces; through the floating adjustment function, the requirements for operation on flat and bumpy ground can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0016] In the attached picture: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is an installation schematic diagram of the present invention.

[0017] In the figure: 1, cylinder barrel, 2, positioning plug, 3, positioning plug top screw, 4, sleeve, 5, piston, 6, piston top screw, 7, rod body, 8, sleeve guide sleeve, 9, rod body guide sleeve, 10, cylinder body earring, 11, rod body earring, 12, oil hole I, 13, oil hole II, 14, seal, 15, support ring seal, 16, multi-stage hydraulic cylinder, 17, shovel plate, 18, vehicle body.

[0018] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0020] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figure 1 to Figure 2 A floating and adjustable multi-stage hydraulic cylinder device is shown, comprising a cylinder 1, a sleeve 4 is arranged inside the cylinder 1, a sealing member 14 is arranged outside the front end of the sleeve 4 and is used in conjunction with the inner wall of the cylinder 1, the sleeve 4, the cylinder 1 and the sealing member 14 form a first-stage piston hydraulic cylinder device, one end of the sleeve 4 is sealed, a piston rod is arranged inside the sleeve 4, the piston rod and the sleeve 4 form a second-stage hydraulic cylinder device, the first-stage rod chamber of the first-stage piston hydraulic cylinder device is communicated with the second-stage rodless chamber of the second-stage hydraulic cylinder device, the second-stage rodless chamber of the second-stage hydraulic cylinder device is communicated with the second-stage rod chamber, the tail of the piston rod is connected with a rod body earring 11, and the rod body earring 11 is connected to the shovel plate end. The floating adjustable multi-stage hydraulic cylinder device of the present invention comprises a cylinder barrel, a sleeve and a piston rod. The cylinder barrel, the sleeve and the sealing member on the sleeve constitute a first-stage piston hydraulic cylinder device. The cylinder barrel is provided with oil ports A and B. Oil is fed in and out through ports A and B, driving the sleeve to reciprocate in the cylinder barrel to realize the function of the hydraulic cylinder. The sleeve and the piston rod constitute a second-stage hydraulic cylinder device, wherein one end of the sleeve is sealed, the piston rod is arranged in the sleeve, the rod chamber and the rodless chamber of the second-stage hydraulic cylinder are interconnected, the second-stage hydraulic cylinder is connected with the rod chamber of the first-stage piston hydraulic cylinder device, the hydraulic oil flows into the second-stage hydraulic cylinder through the first-stage rod chamber, when the piston rod is acted upon by an external force, the piston rod can float in the sleeve to form a plunger-type oil circuit structure, realize the absorption of the external force of the vehicle body, and achieve the shock-absorbing effect.

[0023] like Figure 1 The floating adjustable multi-stage hydraulic cylinder device shown in the figure, the front end of the sleeve 4 is blocked and sealed by a positioning plug 2, the positioning plug 2 and the sleeve 4 are connected together by threads, and the sleeve 4 is provided with a positioning plug top screw 3 for fixing the positioning plug 2. The inner side of the sleeve of the present invention is provided with a positioning plug, which is fixed to the inner side of the sleeve by threads and prevented from loosening by the positioning plug top screw, and the outer circle of the positioning plug is provided with a sealing device to cooperate with the inner circle of the sleeve for sealing.

[0024] like Figure 1 In the floating adjustable multi-stage hydraulic cylinder device shown in the figure, a sleeve guide sleeve 8 is provided between the tail of the sleeve 4 and the cylinder 1, and the sleeve guide sleeve 8 is fixed to the inner wall of the cylinder 1 by threads. The sleeve of the present invention is equipped with a sleeve guide sleeve, and the sealing member on the inner side of the sleeve guide sleeve is sealed with the outer circle of the sleeve, and is fixed to the inner side thread of the cylinder by the outer thread of the sleeve guide sleeve.

[0025] like Figure 1 The illustrated floating adjustable multi-stage hydraulic cylinder device has a seal 14 that divides the first-stage piston hydraulic cylinder device into a first-stage rodless chamber and a first-stage rod chamber. The sleeve 4 is provided with an oil hole Ⅰ12 at the position of the first-stage rod chamber, and the oil hole Ⅰ12 connects the first-stage rod chamber and the second-stage hydraulic cylinder. The seal of the present invention cooperates with the inner side of the cylinder barrel to seal, the left side of the seal is the first-stage rodless chamber, and the right side is the first-stage rod chamber. The sleeve is provided with an oil hole Ⅰ, which penetrates the first-stage rod chamber between the sleeve and the cylinder barrel and the second-stage non-sensing chamber of the second-stage hydraulic cylinder, and hydraulic oil is provided to the second-stage hydraulic cylinder through the oil hole Ⅰ.

[0026] like Figure 1 The multi-stage hydraulic cylinder device with floating adjustment shown in the figure comprises a piston rod including a piston 5 and a rod body 7, wherein the piston 5 is fixed to the small end of the rod body 7 by means of a thread and a piston top screw 6. A support ring seal 15 is arranged on the outer periphery of the piston 5 and is used in conjunction with the inner wall of the sleeve 4. The piston of the present invention is screwed into the small end of the rod body by means of an internal thread and is prevented from loosening by means of a piston top screw; a support ring seal is designed on the outer circumference of the piston and is used in conjunction with the inner hole of the sleeve to play a supporting role.

[0027] like Figure 1 In the floating adjustable multi-stage hydraulic cylinder device shown, a rod guide sleeve 9 is provided between the tail of the rod body 7 and the sleeve 4, and the rod guide sleeve 9 is fixed to the inner wall of the sleeve 4 by threads. The rod guide sleeve of the present invention is inserted into the rod body and fixed to the sleeve by external threads.

[0028] like Figure 1The illustrated floating adjustable multi-stage hydraulic cylinder device has an oil hole II13 on the piston 5, the oil hole II13 connects the secondary rod chamber and the secondary rodless chamber, and the sleeve 4, the piston rod and the oil hole II13 form a plunger type oil circuit structure. The rod body of the present invention is designed with an oil hole at the small end, which passes through the secondary rodless chamber and the secondary rod chamber.

[0029] The principle of the floating adjustable multi-stage hydraulic cylinder device of the present invention is as follows: When the hydraulic oil enters the first-stage rodless chamber of the multi-stage hydraulic cylinder from port A, it will push the sleeve to extend to the right. Since the first-stage rodless chamber is not connected to the second-stage hydraulic cylinder, the hydraulic oil only acts on the first-stage rodless chamber, and the oil in the first-stage rod chamber returns to the oil tank through port B; when the hydraulic cylinder needs to be retracted, it can be retracted by external force, and the hydraulic oil enters port B. Therefore, the hydraulic oil in the first-stage rod chamber of the multi-stage hydraulic cylinder can flow into the second-stage rodless chamber through the oil hole Ⅰ on the sleeve, and the second-stage rodless chamber can flow into the second-stage rod chamber through the oil hole Ⅱ on the rod body and the gap between the piston support ring, forming a two-stage plunger oil circuit structure.

[0030] like Figure 2 A forklift shown in the figure comprises the above-mentioned floating adjustable multi-stage hydraulic cylinder device. During installation, the cylinder earring 10 of the multi-stage hydraulic cylinder 16 is connected to the vehicle body 18, and the rod earring 11 of the multi-stage hydraulic cylinder 16 is connected to the shovel board 17. The earring end of the rod body of the multi-stage hydraulic cylinder of the present invention is installed at the middle hinge point of the shovel board, and the cylinder bottom of the cylinder barrel is fixed to the vehicle body, and the other side of the shovel board is also fixed to the vehicle body. In actual use, due to the weight of the shovel board, the secondary plunger rod body is in a retracted state. At this time, the sleeve can be controlled to extend through the A port to achieve the purpose of controlling the angle of the shovel board; when the shovel board needs to be retracted, the weight of the shovel board can be used to press the rod body to contact the internal positioning plug and reset the sleeve. When the shovel board passes through a protruding stone under the vehicle during driving, the shovel board needs to be lifted by external force, and the earring end of the rod body is pulled out to a certain distance, and the hydraulic oil is replenished through the B port. After passing the protruding stone, the earring end of the rod body is pressed back to the initial state due to the external force, and the rod body shows a floating adjustment phenomenon.

[0031] The present invention provides a floating adjustable multi-stage hydraulic cylinder device and a forklift, which utilize a sealed positioning plug to isolate a first-stage rodless chamber and a second-stage oil circuit, and the second-stage oil circuit is connected to the first-stage rod chamber to form a plunger type oil circuit. When encountering external force, the rod body can be extended by floating adjustment, and can be automatically retracted after the external force disappears, thereby avoiding damage to structural parts and ensuring that the oil cylinder can still be used for a long time under adverse working conditions such as complex terrain, thereby improving the reliability of the hydraulic cylinder and extending the life of the product structural parts.

[0032] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0033] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present invention and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by this application.

[0034] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A floating adjustable multi-stage hydraulic cylinder device, characterized in that: The invention comprises a cylinder (1), wherein a sleeve (4) is arranged inside the cylinder (1), and a sealing member (14) is arranged outside the front end of the sleeve (4) and is used in conjunction with the inner wall of the cylinder (1). The sleeve (4), the cylinder (1) and the sealing member (14) form a primary piston hydraulic cylinder device. One end of the sleeve (4) is sealed, and a piston rod is arranged inside the sleeve (4). The piston rod and the sleeve (4) form a secondary hydraulic cylinder device. The primary rod chamber of the primary piston hydraulic cylinder device is communicated with the secondary rodless chamber of the secondary hydraulic cylinder device, and the secondary rodless chamber of the secondary hydraulic cylinder device is communicated with the secondary rod chamber. The tail of the piston rod is connected to a rod body earring (11), and the rod body earring (11) is connected to the end of the shovel plate.

2. A floating adjustable multi-stage hydraulic cylinder device as claimed in claim 1, characterized in that: The interior of the front end of the sleeve (4) is blocked and sealed by a positioning plug (2); the positioning plug (2) and the sleeve (4) are connected together by threads; and a positioning plug top screw (3) for fixing the positioning plug (2) is provided on the sleeve (4).

3. A floating adjustable multi-stage hydraulic cylinder device as claimed in claim 1, characterized in that: A sleeve guide sleeve (8) is provided between the tail of the sleeve (4) and the cylinder (1), and the sleeve guide sleeve (8) is fixed to the inner wall of the cylinder (1) by means of threads.

4. A floating adjustable multi-stage hydraulic cylinder device as claimed in claim 1, characterized in that: The sealing element (14) divides the first-stage piston hydraulic cylinder device into a first-stage rodless chamber and a first-stage rod chamber. The sleeve (4) is provided with an oil hole I (12) at the position of the first-stage rod chamber. The oil hole I (12) connects the first-stage rod chamber and the second-stage hydraulic cylinder.

5. A floating adjustable multi-stage hydraulic cylinder device as claimed in claim 1, characterized in that: The piston rod comprises a piston (5) and a rod body (7), and the piston (5) is fixed to the small end of the rod body (7) via a thread and a piston top screw (6).

6. A floating adjustable multi-stage hydraulic cylinder device as claimed in claim 5, characterized in that: The outer periphery of the piston (5) is provided with a supporting ring seal (15) for use in conjunction with the inner wall of the sleeve (4).

7. A floating adjustable multi-stage hydraulic cylinder device as claimed in claim 5, characterized in that: A rod body guide sleeve (9) is provided between the tail of the rod body (7) and the sleeve (4), and the rod body guide sleeve (9) is fixed to the inner wall of the sleeve (4) by means of threads.

8. A floating adjustable multi-stage hydraulic cylinder device as claimed in claim 5, characterized in that: The piston (5) is provided with an oil hole II (13), the oil hole II (13) communicating with the secondary rod chamber and the secondary rodless chamber, and the sleeve (4), the piston rod and the oil hole II (13) form a plunger-type oil circuit structure.

9. A forklift, characterized in that: A floating adjustable multi-stage hydraulic cylinder device comprising any one of claims 1-8.

10. A forklift according to claim 9, characterized in that: During installation, the cylinder body earring (10) of the multi-stage hydraulic cylinder (16) is connected to the vehicle body (18), and the rod body earring (11) of the multi-stage hydraulic cylinder (16) is connected to the shovel plate (17).

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