Oscillating cylinder capable of passing oil in middle

Abstract

The utility model discloses a swing cylinder capable of passing oil in the middle, which comprises a cylinder body, an output screw and a hollow screw, the hollow screw is connected with the output screw through a first screw pair, a fixing nut is arranged in the cylinder body, and the hollow screw is connected with the fixing nut through a second screw pair. The hollow screw rod is arranged in the cylinder body and divides an inner cavity of the cylinder body into a first cavity body and a second cavity body, the first cavity body and the second cavity body are suitable for oil passing and driving the output screw rod to rotate forwards or reversely, and an oil way is formed in the output screw rod and suitable for being communicated with a lifting oil cylinder. Oil is injected into the first cavity and the second cavity respectively so as to control the output screw connected with the hollow screw to rotate forwards or backwards, meanwhile, the oil way is further formed in the output screw and directly communicated with the lifting oil cylinder, the oil way is further arranged in the output screw, the structure can be more compact, and the structure is more compact. And meanwhile, the rod diameter of the output screw rod is maximized in a limited space, so that the bearing of the oscillating cylinder is maximized.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a swing cylinder capable of passing oil through the middle. Background Art

[0002] As smart warehousing becomes increasingly popular, the need for optimal warehouse space utilization is increasing. To meet these demands, a narrow-aisle forklift is needed to enable rapid cargo handling within a smaller space.

[0003] However, the output screw rod in the current swing cylinder has a small diameter and can withstand a small bending moment, resulting in the inability to lift the forklift load; and there is no integrated angle sensor in the swing cylinder, which cannot detect the swing angle; there is no integrated explosion-proof valve in the swing cylinder, which cannot protect the oil cylinder when the forklift is overloaded; the fixing nut in the swing cylinder is fixed to the cylinder barrel by welding, which is prone to welding deformation, resulting in poor accuracy; and the axis gasket in the current swing cylinder is made of non-metallic material, which has planar friction with the rod and has a large friction coefficient.

[0004] In view of this, it is necessary to design a swing cylinder that can pass oil in the middle to solve the above problems. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the utility model provides a swing cylinder capable of intermediate oil flow, which can improve the bearing capacity.

[0007] The first aspect of the present invention provides a swing cylinder with intermediate oil flow, comprising a cylinder body, an output screw and a hollow screw, the hollow screw being connected to the output screw via a first spiral pair, a fixing nut being provided in the cylinder body, the hollow screw being connected to the fixing nut via a second spiral pair, the hollow screw being arranged in the cylinder body and dividing the inner cavity of the cylinder body into a first cavity and a second cavity, the first cavity and the second cavity being suitable for oil flow and driving the output screw to rotate forward or reversely, an oil circuit being provided in the output screw, the oil circuit being suitable for connecting to a lifting oil cylinder, and an end cover being provided at the open end of the cylinder body, the output screw extending from the center of the end cover.

[0008] Preferably, the first cavity is formed between the hollow screw and the fixing nut, and a reversing oil port is provided on the cylinder body, and the reversing oil port is connected to the first cavity.

[0009] Further preferably, the second cavity is formed between the hollow screw and the cylinder body, the second cavity is isolated from the first cavity via the hollow screw, and a forward oil port is opened on the cylinder body, and the forward oil port is connected to the second cavity.

[0010] Preferably, the inner wall of the cylinder body is provided with a limiting step at a portion of the second cavity, and the limiting ring is fixedly installed in the second cavity away from the hollow screw rod via the limiting step.

[0011] Further preferably, a T oil port is further formed in the cylinder body, a connecting portion is radially extended from the T oil port and the oil passage, an oil inlet cavity is formed between the connecting portion and the inner wall of the cylinder body, and the T oil port and the oil passage are in communication via the oil inlet cavity.

[0012] Preferably, needle bearings are arranged on both sides of the connecting portion, and a sealing ring is arranged between the needle bearing close to the hollow screw rod and the oil inlet cavity, and the sealing ring is suitable for isolating the oil liquid communication between the oil inlet cavity and the second cavity.

[0013] Further preferably, an explosion-proof valve mounting hole is formed in the oil passage away from the hollow screw rod, and an explosion-proof valve is arranged in the explosion-proof valve mounting hole.

[0014] Preferably, one end of the cylinder body is axially recessed towards the output screw rod to form a mounting position, an angle sensor is arranged in the mounting position, and the angle sensor is fixedly installed in the mounting position via a sensor mounting plate.

[0015] Further preferably, hole sealing grooves and rod sealing grooves are formed in the hollow screw rod, the rod sealing grooves are arranged towards the output screw rod, the hole sealing grooves are arranged towards the inner wall of the cylinder body, and sealing members are arranged on the hole sealing grooves and the rod sealing grooves respectively, and the sealing members are suitable for isolating the oil liquid communication between the first cavity and the second cavity.

[0016] Preferably, the portion of the output screw rod extending out of the end cover is further provided with a flat key and a cylindrical pin, the flat key is suitable for transmitting torque to the outside, and the cylindrical pin is suitable for positioning and marking the middle position of the swing angle.

[0017] The beneficial effects of the utility model are that the hollow screw rod divides the internal space of the cylinder body into a first cavity and a second cavity, oil is injected into the first cavity and the second cavity respectively, the output screw rod connected with the hollow screw rod can be controlled to rotate forward or reverse, an oil passage is further formed in the output screw rod, the oil passage is directly communicated with the lifting oil cylinder, the oil passage is arranged in the output screw rod, the structure is more compact, the rod diameter of the output screw rod is maximized in the limited space, and the load bearing of the swing cylinder is maximized.

[0018] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The objectives and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the internal structure of the swing cylinder capable of intermediate oil flow according to the present invention;

[0022] Figure 2 It is a three-dimensional diagram of the swing cylinder with middle oil flow according to the present invention.

[0023] Description of reference numerals:

[0024] 1. Cylinder body; 2. Limit ring; 3. Output screw; 31. Connecting part; 4. Fixing nut; 5. Hollow screw; 51. Rod seal groove; 52. Hole seal groove; 6. End cover; 7. Sensor mounting plate; 8. Sensor fixing plate; 9. Cover plate; 10. Angle sensor; 11. Explosion-proof valve; 12. Locating pin; 13. Needle roller bearing; 14. First cavity; 15. Second cavity; 16. Oil circuit; 17. Flat key; 18. Cylindrical pin; 19. Oil inlet chamber; A. Reverse oil port; B. Forward oil port; C. T oil port. DETAILED DESCRIPTION

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention only in a schematic manner, and therefore only show components relevant to the present invention. In the description of the present invention, it should be understood that, unless otherwise specified, "multiple" means two or more, "bottom" refers to the bottom of the structure shown in the drawings, and "top" refers to the top of the structure shown in the drawings.

[0026] See also Figure 1The embodiment of the utility model provides a swing cylinder with intermediate oil flow, including a cylinder body 1, an output screw 3 and a hollow screw 5. The hollow screw 5 is connected to the output screw 3 through a first spiral pair. A fixing nut 4 is also provided in the cylinder body 1. The hollow screw 5 is connected to the fixing nut 4 via a second spiral pair. The hollow screw 5 is arranged in the cylinder body 1, and the hollow screw 5 divides the internal cavity of the cylinder body 1 into a first cavity 14 and a second cavity 15. Oil can flow through the first cavity 14 and the second cavity 15 respectively to drive the output screw 3 to rotate forward or reverse, and an oil circuit 16 is also opened in the output screw 3. The oil circuit 16 can be directly connected to the lifting cylinder to supply oil to the lifting cylinder. This arrangement can make the overall structure of the swing cylinder more compact.

[0027] In some embodiments, a fixing nut 4 is further provided in the cylinder body 1, and the fixing nut 4 is connected to the inner wall of the cylinder body 1. The hollow screw 5 is connected to the fixing nut 4 via a second screw pair, and the first cavity 14 is formed between the hollow screw 5 and the fixing nut 4. The cylinder body 1 is provided with a reversing oil port A, which is connected to the first cavity 14 and can supply oil to the first cavity 14. When oil is supplied to the first cavity 14, the oil pushes the hollow screw 5 to move along the first axial direction of the output screw 3. The movement of the hollow screw 5 drives the output screw 3 to reverse, thereby achieving the swing of the swing cylinder in one direction.

[0028] Specifically, a hole sealing groove 52 and a rod sealing groove 51 are provided on the hollow screw 5. The rod sealing groove 51 is arranged toward the output screw 3, and the hole sealing groove 52 is arranged toward the inner wall of the cylinder body 1. Seals are respectively provided on the hole sealing groove 52 and the rod sealing groove 51, which can isolate the oil flow between the first cavity 14 and the second cavity 15.

[0029] In some embodiments, a second cavity 15 is formed between the hollow screw 5 and the cylinder body 1. The second cavity 15 is isolated from the first cavity 14 via the hollow screw 5, and a forward oil port B is also provided on the cylinder body 1. The forward oil port B is connected to the second cavity 15, so that oil is input into the second cavity 15 through the forward oil port B, and pushes the hollow screw 5 to move along the axial direction of the output screw 3. At this time, the hollow screw 5 moves while driving the output screw 3 to rotate forward, thereby realizing the swing of the output screw 3 in the opposite direction.

[0030] In some embodiments, a limit step is provided in the portion of the cylinder body 1 located in the second cavity 15, and a limit ring 2 is fixedly mounted via the limit step to the end of the second cavity 15 away from the hollow screw 5. The limit ring 2 can limit the travel of the hollow screw 5, and the travel of the hollow screw 5 can also limit the forward or reverse rotation of the output screw 3.

[0031] In some embodiments, a T oil port C is further provided on the cylinder body 1, and a connecting portion 31 is radially extended from the output screw 3. The connecting portion 31 corresponds to the connection between the T oil port C and the oil circuit 16, and an oil inlet chamber 19 is formed between the connecting portion 31 and the inner wall of the cylinder body 1. The T oil port C is connected to the oil circuit 16 via the oil inlet chamber 19, and oil is then transported into the oil inlet chamber 19 through the T oil port C, and the oil is transported to the lifting cylinder through the oil circuit 16 through the oil inlet chamber 19 to realize oil supply to the lifting cylinder.

[0032] Specifically, needle bearings 13 are provided on both sides of the connecting portion 31, and an end cover 6 is provided at the open end of the cylinder body 1. The output screw 3 extends from the center of the end cover 6, and the end cover 6 is threadedly connected to the cylinder body 1 and fixed to the end cover 6 by a positioning pin 12, so that the output screw 3 can only rotate and cannot produce radial deviation.

[0033] The needle bearing 13 on one side of the connecting part 31 is arranged between the end cover 6 and the connecting part 31, and the needle bearing 13 on the other side of the connecting part 31 is arranged between the limiting ring 2 and the connecting part 31. At the same time, a sealing ring is provided between the oil inlet chamber 19 and the needle bearing 13, through which the oil in the oil inlet chamber 19 and the oil in the second cavity 15 can be isolated from each other.

[0034] In addition, an explosion-proof valve mounting hole is provided at one end of the oil circuit 16 away from the hollow screw 5 , in which an explosion-proof valve 11 is provided. The explosion-proof valve 11 can protect the cylinder body 1 from damage caused by overloading.

[0035] See also Figure 2 One end of the cylinder body 1 is recessed in the circumferential direction toward the output screw 3 to form a mounting position, in which an angle sensor 10 is installed. The angle sensor 10 is fixed in the mounting position via a sensor mounting plate 7, and the sensor mounting plate 7 and the sensor are fixed via a sensor fixing plate 8. A cover plate 9 is also provided at the opening of the mounting position to protect the angle sensor 10 from damage during movement.

[0036] A specific embodiment of the present invention provides engineering machinery employing the swing cylinder capable of intermediate oil transfer described in any of the aforementioned embodiments. The engineering machinery primarily includes equipment such as forklifts. Furthermore, a flat key 17 and a cylindrical pin 18 are provided on the output screw 3. The cylindrical pin 18 is used to locate and mark the center position of the swing angle. The flat key 17 is capable of connecting to the boom of the forklift and transmitting torque to the boom via the flat key 17.

[0037] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] The above-described ideal embodiments according to the present application are for inspiration, and through the above description, relevant personnel can certainly make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and the technical scope must be determined by the scope of claims.

Claims

1. A swing cylinder capable of intermediate oil flow, characterized in that: The invention comprises a cylinder body (1), an output screw rod (3) and a hollow screw rod (5), wherein the hollow screw rod (5) is connected to the output screw rod (3) via a first screw pair, a fixing nut (4) is provided in the cylinder body (1), and the hollow screw rod (5) is connected to the fixing nut (4) via a second screw pair, the hollow screw rod (5) is arranged in the cylinder body (1) and divides the inner cavity of the cylinder body (1) into a first cavity (15) and a second cavity (16), the first cavity (15) and the second cavity (16) are suitable for passing oil and driving the output screw rod (3) to rotate forward or reverse, an oil path (16) is provided in the output screw rod (3), and the oil path (16) is suitable for connecting to a lifting cylinder, and an end cover (6) is provided at the open end of the cylinder body (1), and the output screw rod (3) extends from the center of the end cover (6).

2. The swing cylinder capable of intermediate oil flow according to claim 1, characterized in that: The first cavity (15) is formed between the hollow screw (5) and the fixing nut (4), and a reversing oil port (A) is provided on the cylinder body (1), and the reversing oil port (A) is connected to the first cavity (15).

3. The swing cylinder capable of intermediate oil flow according to claim 2, characterized in that: The second cavity (16) is formed between the hollow screw (5) and the cylinder body (1), and the second cavity (16) is isolated from the first cavity (15) via the hollow screw (5). A forward oil port (B) is provided on the cylinder body (1), and the forward oil port (B) is connected to the second cavity (16).

4. The swing cylinder capable of intermediate oil flow according to claim 3, characterized in that: A limiting step is provided on the inner wall of the cylinder body (1) at the portion of the second cavity (16), and a limiting ring (2) is fixedly mounted on the end of the second cavity (16) away from the hollow screw (5) via the limiting step.

5. The swing cylinder capable of intermediate oil flow according to claim 1, characterized in that: The cylinder body (1) is also provided with a T oil port (C), and the output screw rod (3) radially extends a connecting portion (31) corresponding to the connection between the T oil port (C) and the oil circuit. An oil inlet cavity (19) is formed between the connecting portion (31) and the inner wall of the cylinder body (1), and the T oil port (C) and the oil circuit are connected via the oil inlet cavity (19).

6. The swing cylinder capable of intermediate oil flow according to claim 5, characterized in that: Needle bearings (13) are provided on both sides of the connecting portion (31), and a sealing ring is provided between the needle bearing (13) on the side close to the hollow screw (5) and the oil inlet cavity (19), and the sealing ring is suitable for isolating the oil flow between the oil inlet cavity (19) and the second cavity (16).

7. The swing cylinder capable of intermediate oil flow according to any one of claims 1 to 6, characterized in that: An explosion-proof valve installation hole is provided at one end of the oil circuit (16) away from the hollow screw (5), and an explosion-proof valve (11) is provided in the explosion-proof valve installation hole.

8. The swing cylinder capable of intermediate oil flow according to any one of claims 1 to 6, characterized in that: One end of the cylinder body (1) is recessed toward the axial direction of the output screw (3) to form a mounting position, in which an angle sensor (10) is provided. The angle sensor (10) is fixedly mounted in the mounting position via a sensor mounting plate (7).

9. The swing cylinder capable of intermediate oil flow according to any one of claims 1 to 6, characterized in that: The hollow screw (5) is provided with a hole sealing groove (52) and a rod sealing groove (51), wherein the rod sealing groove (51) is arranged toward the output screw (3), and the hole sealing groove (52) is arranged toward the inner wall of the cylinder (1), and sealing members are respectively provided on the hole sealing groove (52) and the rod sealing groove (51), and the sealing members are suitable for isolating the oil flow between the first cavity (14) and the second cavity (15).

10. The slewing cylinder capable of intermediate oil flow according to any one of claims 1 to 6, characterized in that: The portion of the output screw (3) extending out of the end cover (6) is further provided with a flat key (17) and a cylindrical pin (18). The flat key (17) is suitable for transmitting torque to the outside, and the cylindrical pin (18) is suitable for locating and marking the center position of the swing angle.

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