Ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support

Abstract

The invention provides an ultra-long-stroke hydraulic cylinder transmission device capable of improving the stability of a piston rod of a hydraulic cylinder so as to improve the bearing capacity of the hydraulic cylinder under the ultra-long stroke, and relates to the technical field of ultra-long-stroke hydraulic cylinders. An ultra-long stroke hydraulic cylinder transmission device with a differential auxiliary support comprises a load component, an installation foundation, a linear guide rail and an ultra-long stroke hydraulic cylinder, a piston rod is sleeved with at least one differential supporting plate arranged in the extending direction of the linear guide rail in a sliding mode, and the differential supporting plate is in sliding fit with the piston rod. The differential support plate is arranged on the piston rod, so that the piston rod moves forwards relative to the differential support plate when extending out, the differential support plate moves to the position between the two ends of the piston rod, and the differential support plate is connected with the load component so as to pull the differential support plate to slide along with the piston rod in the extending-out process of the piston rod. Therefore, the differential support plate is supported on a connecting piece between the two ends of the piston rod.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-long stroke hydraulic cylinders, in particular to an ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support. Background Art

[0002] The hydraulic cylinder transmission device is a device that uses liquid to transmit power. It can efficiently transmit power and control the movement of actuators. It has been widely used in engineering machinery, the automotive industry, industrial equipment and other fields.

[0003] An ultra-long-stroke hydraulic cylinder generally refers to a cylinder with a piston rod stroke exceeding 5 meters. With the further development of hydraulic technology, ultra-long-stroke hydraulic cylinder transmissions have become increasingly widely used. Ultra-long-stroke hydraulic cylinder transmissions have a stroke exceeding that of conventional hydraulic cylinder transmissions, enabling them to meet the wide range of motion requirements in certain applications. However, the extra-long stroke also reduces the stability of the piston rod, making it highly susceptible to destabilization under external disturbances. This leads to a sharp decrease in the load-bearing capacity of ultra-long-stroke hydraulic cylinders. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an ultra-long stroke hydraulic cylinder transmission device capable of improving the stability of the hydraulic cylinder piston rod, so as to improve the load-bearing capacity of the hydraulic cylinder under ultra-long stroke.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support, comprising a load component, a mounting base, a linear guide rail and an ultra-long stroke hydraulic cylinder, wherein the load component is mounted on the linear guide rail so as to be able to slide along the linear guide rail, the ultra-long stroke hydraulic cylinder is mounted on the mounting base and arranged along the extension direction of the linear guide rail, and the piston rod of the ultra-long stroke hydraulic cylinder is connected to the load component so as to push the load component to slide along the linear guide rail;

[0006] The piston rod is sleeved with at least one differential support plate which is slidably arranged along the extension direction of the linear guide rail. The differential support plate is slidably matched with the piston rod so that the piston rod first moves forward relative to the differential support plate when extending, so that the differential support plate moves between the two ends of the piston rod. The differential support plate is provided with a connection with the load component to pull the differential support plate to slide with the piston rod during the extension of the piston rod, so that the differential support plate supports the connecting piece between the two ends of the piston rod.

[0007] Furthermore, the connecting member is a pull rod arranged along the extension direction of the linear guide rail and passing through the differential support plate;

[0008] One end of the pull rod extends to connect with the load component, the pull rod is slidably matched with the differential support plate, and a limit block is provided on the pull rod, which is spaced apart and abuts against a side surface of the differential support plate away from the load component.

[0009] Furthermore, the piston rod is hinged to the load component via a hinge axis perpendicular to the extension direction of the linear guide rail.

[0010] Furthermore, the number of the differential support plates is n, where n is equal to L. max The quotient after division by L is rounded down, where L max is the maximum working distance of the piston rod, L is the maximum extension length of the piston rod in the critical instability state when the differential support plate is not provided, L=π√EI / F P , E is the elastic modulus of the piston rod, I is the centroid principal moment of inertia of the piston rod cross section, F P is the load exerted by the load component on the piston rod.

[0011] Furthermore, when n=1, the maximum distance d from the side surface of the differential support plate away from the load component to the load component is d=L max / 2+L0+L1, where L0 is the thickness of the differential support plate, and L1 is the distance from the end of the piston rod to the load component;

[0012] When n≥2, the maximum distance from the side of the Nth differential support plate away from the load component to the load component in the direction from the load component to the ultra-long stroke hydraulic cylinder is d N , d N =NL max / (N+1)+NL0+L1, N is an integer, N≥1.

[0013] The beneficial effects of the present invention are as follows: an ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support of the present invention, a differential support plate that slides with the piston rod is sleeved on the piston rod, and the piston rod will first move forward relative to the differential support plate when extending, so that the differential support plate gradually moves to the middle position of the piston rod, and the piston rod gradually pulls each of the differential support plates through the connecting piece during the extension process to gradually slide with the piston rod, so that the relative position of each differential support plate and the piston rod no longer changes, so that each of the differential support plates gradually supports the corresponding position between the two ends of the piston rod in turn during the extension process of the piston rod, so that the piston rod is not easy to bend and deform, the rigidity of the piston rod during operation is enhanced, and the stability and load-bearing capacity of the hydraulic cylinder piston rod are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 yes Figure 1 A top view of

[0016] Figure 3 This is a schematic diagram of the structure when there are two differential support plates;

[0017] As shown in the figure: installation base 1, load component 2, ultra-long stroke hydraulic cylinder 3, linear guide 4, differential support plate 5, connecting part 6, hinge shaft 7, piston rod 31, pull rod 61, and limit block 62. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] like Figures 1 to 3 As shown, an ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support of the present invention includes a load component 2, a mounting base 1, a linear guide 4 and an ultra-long stroke hydraulic cylinder 3, wherein the load component 2 is mounted on the linear guide 4 so as to be able to slide along the linear guide 4, the ultra-long stroke hydraulic cylinder 3 is mounted on the mounting base 1 and is arranged along the extension direction of the linear guide 4, and the piston rod 31 of the ultra-long stroke hydraulic cylinder 3 is connected to the load component 2 to push the load component 2 to slide along the linear guide 4. The piston rod 31 is sleeved with at least one differential support plate 5 that slides along the extension direction of the linear guide rail 4. The differential support plate 5 and the piston rod 31 are slidably engaged, so that when the piston rod 31 is extended, it first moves forward relative to the differential support plate 5, and then gradually moves to a position midway between the two ends of the piston rod 31. The differential support plate 5 is provided with a connecting member 6 connected to the load component 2 to pull the differential support plate 5 to slide with the piston rod 31 during the extension of the piston rod 31, thereby ensuring that the differential support plate 5 is always supported between the two ends of the piston rod 31. The connecting member 6 can be a soft rope.

[0020] The extra-long stroke hydraulic cylinder 3 is arranged along the extending direction of the linear guide rail 4 , that is, the axis of the extra-long stroke hydraulic cylinder 3 is parallel to the extending direction of the linear guide rail 4 .

[0021] In the figure, the differential support plate 5 is slidably connected to the linear guide rail 4 to achieve a sliding arrangement along the extension direction of the linear guide rail 4. Of course, the differential support plate 5 can also be slidably connected to a guide rail separately provided along the extension direction of the linear guide rail 4 to achieve a sliding arrangement along the extension direction of the linear guide rail 4.

[0022] In the present invention, the piston rod can be welded or bolted to the load component 2 via a connector. In the present invention, the piston rod 31 is hingedly connected to the load component 2 via a hinge shaft 7 perpendicular to the extension direction of the linear guide rail 4. The hinged connection between the piston rod 31 and the load component 2 can better protect the piston rod 31 from forces along the piston rod axis, thereby increasing the upper limit of its load-bearing capacity.

[0023] The present invention is provided with at least one differential support plate 5 which is slidably arranged along the extension direction of the linear guide rail 4 on the piston rod 31. The differential support plate 5 is slidably matched with the piston rod 31, so that when the piston rod 31 is extended, it first moves forward relative to the differential support plate 5, that is, differentially, so that the differential support plate 5 moves between the two ends of the piston rod 31. The differential support plate 5 is provided with a connection with the load component 2 to pull the differential support plate 5 to slide with the piston rod 31 during the extension of the piston rod 31, so that the differential support plate 5 supports the piston rod 31. The connecting member 6 is supported between the two ends of the piston rod 31. In this way, during the extension process of the piston rod 31, the connecting member 6 can gradually pull each of the differential support plates 5 to gradually slide with the piston rod 31, so that the relative position of each differential support plate 5 and the piston rod 31 no longer changes. As a result, each of the differential support plates 5 gradually supports the corresponding position between the two ends of the piston rod 31 during the extension process of the piston rod, making the piston rod less likely to bend and deform, strengthening the rigidity of the piston rod during operation, and improving the stability and load-bearing capacity of the hydraulic cylinder piston rod. When the piston rod retracts, the differential support plate 5 is acted upon by the load component 2 and eventually slides with the end of the piston rod to the cylinder barrel of the extra-long stroke hydraulic cylinder 3, ready to support the piston rod when it is extended next time.

[0024] The number of differential support plates 5 can be one or more. Generally speaking, the greater the working stroke of the piston rod, the more differential support plates 5 should be. However, if there are too many differential support plates 5, the further strengthening effect on the piston rod will be limited and the stroke of the piston rod will be affected. In the present invention, when the piston rod 31 is hinged to the load component 2 through the hinge shaft 7 perpendicular to the extension direction of the linear guide 4, according to the instability analysis of the piston rod, the optimal number of differential support plates 5 is n, where n is equal to L. max The quotient after division by L is rounded down, where L max is the maximum working distance of the piston rod 31, that is, the maximum moving distance of the load component 2 when working. L is the maximum extension length of the piston rod 31 in the critical instability state when the differential support plate 5 is not provided. L=π√EI / F P , E is the elastic modulus of the piston rod 31, I is the centroid principal moment of inertia of the cross section of the piston rod 31, F Pis the load of the load component 2 on the piston rod 31. The final setting position of the differential support plate 5 affects the strengthening effect of the piston rod 31. Furthermore, in order to better support and strengthen the piston rod 31, when n=1, the maximum distance between the side of the differential support plate 5 away from the load component 2 and the load component 2 is d, which is the distance between the side of the differential support plate 5 away from the load component 2 and the load component 2 after the piston rod 31 is extended and the positions of the differential support plate 5 and the piston rod 31 are relatively fixed. d=L max / 2+L0+L1, where L0 is the thickness of the differential support plate 5, L1 is the distance from the end of the piston rod 31 to the load component 2, and L1 can be 0; when n ≥ 2, the maximum distance from the side of the Nth differential support plate 5 away from the load component 2 to the load component 2 in the direction from the load component 2 to the ultra-long stroke hydraulic cylinder 3 is d N , d N That is, after the piston rod 31 extends, the position of the differential support plate 5 and the piston rod 31 are relatively fixed, and the distance from the side of the differential support plate 5 away from the load component 2 to the load component 2, d N =NL max / (N+1)+NL0+L1, N is an integer, N≥1.

[0025] In the present invention, the connecting member 6 is a pull rod 61 arranged along the extension direction of the linear guide rail 4 and inserted into the differential support plate 5. One end of the pull rod 61 extends and connects to the load component 2. The pull rod 61 slides with the differential support plate 5. In this way, the pull rod 61 can slide relative to the differential support plate 5 along with the piston rod 31 during the extension process of the piston rod 31, preventing the differential support plate 5 from initially moving with the piston rod 31. The pull rod 61 is provided with a limit block 62 that is spaced from and abuts against the side surface of the differential support plate 5 away from the load component 2. The specific distance between the limit block 62 and the side surface of the differential support plate 5 away from the load component 2 is set according to the final support position of the corresponding differential support plate 5 after the piston rod 31 is extended.

[0026] When the piston rod 31 is extended, the piston rod pushes the load component 2 to slide along the linear guide 4, and the load component 2 drives the pull rod 61 and the limit block 62 on the pull rod to move along the extension direction of the linear guide 4. As the piston rod continues to extend and become longer, the limit block 62 on the pull rod 61 gradually approaches the differential support plate 5 and abuts against the side of the differential support plate 5 away from the load component 2, thereby gradually pulling the differential support plate 5 to move with the piston rod 31 through the pull rod, so that the differential support plate 5 is always supported at the corresponding position of the piston rod, thereby strengthening the corresponding position of the piston rod to ensure the rigidity of the piston rod during extension.

[0027] When there are multiple differential support plates 5 , each differential support plate 5 may share the same pull rod 61 or each differential support plate 5 may be independently provided with a pull rod.

[0028] In the present invention, the entire transmission device can be arranged horizontally, vertically or inclined.

Claims

1. An ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support, comprising a load component (2), a mounting base (1), a linear guide rail (4) and an ultra-long stroke hydraulic cylinder (3), wherein the load component (2) is mounted on the linear guide rail (4) so as to be able to slide along the linear guide rail (4), the ultra-long stroke hydraulic cylinder (3) is mounted on the mounting base (1) and is arranged along the extension direction of the linear guide rail (4), the piston rod (31) of the ultra-long stroke hydraulic cylinder (3) is connected to the load component (2) so as to push the load component (2) to slide along the linear guide rail (4), and is characterized in that: The piston rod (31) is sleeved with at least one differential support plate (5) which is slidably arranged along the extension direction of the linear guide rail (4). The differential support plate (5) and the piston rod (31) are slidably matched, so that when the piston rod (31) is extended, it first moves forward relative to the differential support plate (5), so that the differential support plate (5) moves between the two ends of the piston rod (31). The differential support plate (5) is connected to the load component (2) to pull the differential support plate (5) to slide with the piston rod (31) during the extension process of the piston rod (31), so that the differential support plate (5) supports the connecting piece (6) between the two ends of the piston rod (31).

2. The ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support according to claim 1, characterized in that: The connecting member (6) is a pull rod (61) arranged along the extension direction of the linear guide rail (4) and passing through the differential support plate (5); One end of the pull rod (61) extends to connect with the load component (2), and the pull rod (61) is slidably matched with the differential support plate (5). The pull rod (61) is provided with a limit block (62) spaced apart from and abutting against the side surface of the differential support plate (5) away from the load component (2).

3. The ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support according to claim 1, characterized in that: The piston rod (31) is hinged to the load component (2) via a hinge shaft (7) perpendicular to the extension direction of the linear guide rail (4).

4. The ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support according to claim 3, characterized in that: The number n of the differential support plates (5) is equal to L max The quotient after division by L is rounded down, where L max is the maximum working distance of the piston rod (31), L is the maximum extension length of the piston rod (31) in a critical instability state when the differential support plate (5) is not provided, E is the elastic modulus of the piston rod (31), I is the centroid principal moment of inertia of the cross section of the piston rod (31), and F P is the load exerted by the load component (2) on the piston rod (31).

5. The ultra-long stroke hydraulic cylinder transmission device with differential auxiliary support according to claim 4, characterized in that: When n=1, the maximum distance d between the side surface of the differential support plate (5) away from the load component (2) and the load component (2) is d=L max / 2+L0+L1, wherein L0 is the thickness of the differential support plate (5), and L1 is the distance from the end of the piston rod (31) to the load component (2); When n≥2, in the direction from the load component (2) to the ultra-long stroke hydraulic cylinder (3), the maximum distance from the side surface of the Nth differential support plate (5) away from the load component (2) to the load component (2) is d N , d N =NL max / (N+1)+NL0+L1, N is an integer, N≥1.

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