Multi-stage hydraulic oil cylinder of horizontal pushing type dumper

Abstract

The utility model discloses a multi-stage hydraulic oil cylinder of a horizontal pushing type dumper, which relates to the technical field of hydraulic oil cylinders and comprises an outer cylinder, a plurality of piston rods are arranged in the outer cylinder and sequentially sleeved along the direction from the axis of the outer cylinder to the excircle, and any two adjacent piston rods are in sliding connection along the axis direction. The outer cylinder is further provided with a hydraulic oil way used for driving all the piston rods to move, the multiple supporting pieces are arranged in the length direction of the piston rods, the multiple supporting pieces are arranged on the outer sides of the different piston rods in a sleeving mode and synchronously move along with the corresponding piston rods, and supporting plates are arranged at the lower ends of the supporting pieces. The end, away from the supporting piece, of the supporting plate is rotationally connected with a supporting wheel. The rotating direction of the supporting wheel is the same as the moving direction of the piston rod. The multi-stage oil cylinder has the effect of prolonging the service life of the multi-stage oil cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a multi-stage hydraulic cylinder for a flat-push type dump truck. Background Art

[0002] A flat-push type dump truck is a type of dump truck. A push bucket that slides horizontally is installed in the carriage. When unloading goods, a special hydraulic cylinder drives the push bucket to move horizontally, so that the push bucket moves the materials in the carriage out. It is mainly applicable to operation activities in spaces with limited height such as mine shafts. Since the push bucket needs to move a long distance, a hydraulic cylinder with a long stroke and many stages is required.

[0003] For the related technology above, a Chinese patent with the publication number CN219655010U discloses a multi-stage cylinder, which includes a cylinder barrel and a bottom cylinder cover. The bottom cylinder cover is connected to the bottom end of the cylinder barrel, and an oil port of the rodless cavity and an oil port of the rod cavity are provided on the bottom cylinder cover. A telescopic assembly and an oil circuit assembly are arranged in the cylinder barrel. The telescopic assembly includes an outer rod barrel, a middle rod barrel, and an inner rod barrel; the oil circuit assembly includes a first oil pipe, a second oil pipe, and a third oil pipe. The inlet and outlet oil circuits of this device are realized by the expansion and contraction of the oil circuit assembly. It not only runs smoothly, but also greatly reduces the processing difficulty. When working, it is supported by the middle oil circuit assembly, which improves the stability of the cylinder during telescoping, solves the problems of easy misalignment and telescopic jamming during the telescoping of the multi-stage cylinder, improves the service life of the cylinder, and reduces potential safety hazards.

[0004] In view of the above related technology, since the working stroke of the multi-stage cylinder is relatively long, the rod barrel of the multi-stage cylinder is prone to bending under the action of its own weight. When the materials driven by the multi-stage cylinder are relatively heavy, the rod barrel will bear a large force, and at this time, the rod barrel is prone to deformation along the bending direction, which will further cause damage to the rod barrel and affect the service life of the multi-stage cylinder. Content of the Utility Model

[0005] In order to improve the service life of the multi-stage cylinder, this application provides a multi-stage hydraulic cylinder for a flat-push type dump truck.

[0006] This application provides a multi-stage hydraulic cylinder for a flat-push type dump truck, and adopts the following technical solutions:

[0007] A multi-stage hydraulic cylinder for a flat-push self-unloading truck, comprising an outer cylinder. A number of piston rods are arranged inside the outer cylinder. The piston rods are sleeved in sequence along the direction from the axis of the outer cylinder to the outer circle, and any two adjacent piston rods are slidably connected along the axial direction. The outer cylinder is also provided with a hydraulic oil circuit for driving all the piston rods to move. The multi-stage hydraulic cylinder further comprises a number of support members. The support members are arranged along the length direction of the piston rods. The support members are sleeved outside different piston rods and move synchronously with the corresponding piston rods. A support plate is provided at the lower end of the support member. A support wheel is rotatably connected to the end of the support plate away from the support member. The rotation direction of the support wheel is the same as the moving direction of the piston rod.

[0008] By adopting the above technical solution, the outer cylinder drives all the piston rods to move in sequence through the hydraulic oil circuit. When installing the multi-stage cylinder, the support wheel is in contact with the plane of the installation position. When the piston rod drives the support member to move, the support member drives the support wheel to move along the moving direction of the piston rod through the support plate. The support wheel and the support plate cooperate to support the support member, and then the support member supports the piston rod, which is beneficial to reducing the probability of the piston rod bending due to its own weight when extending, beneficial to reducing the probability of the piston rod being damaged, and improving the service life of the multi-stage cylinder.

[0009] Optionally, among the piston rods, the piston rod connected to the support member is set as a support rod. The support member is provided with an installation hole adapted to the outer circle of the support rod. A support ring is arranged in the installation hole. The support ring is fixedly connected to the support member. The support rod passes through the support ring and fits with the inner wall of the support ring. Two groups of annular grooves are circumferentially arranged on the outer circle of the support rod. The support ring is located between the two annular grooves. Limit rings are arranged in the annular grooves. When the support rod moves, it drives the limit rings to move. The outer diameter of the limit ring is larger than the outer diameter of the support rod. The limit ring is made of deformable material, and both limit rings are in contact with the support ring.

[0010] By adopting the above technical solution, the support rod limits the limit rings through the annular grooves, so that the two limit rings cooperate to clamp and position the support ring. When the support rod drives the limit rings to move, the two limit rings cooperate to drive the support ring and the support member to move. When the support of the support member is not required, the limit rings can be removed to release the limit on the support member, which is beneficial to improving the convenience of use of the support member.

[0011] Optionally, the support rod is provided with a guiding surface communicating with the inner wall of the annular groove. The guiding surface is along the axial direction of the support rod and gradually inclines from the outer circle of the support rod to the axis.

[0012] By adopting the above technical solution, when disassembling or installing the limit rings, the limit rings are moved along the guiding surface, so that the limit rings are gradually deformed along with the guiding surface, which is beneficial to improving the convenience when disassembling or installing the limit rings.

[0013] Optionally, a mounting groove is provided on one side of the support ring close to the outer tube. Among the two limiting rings, the limiting ring close to the outer tube is located in the mounting groove and fits against the inner wall of the mounting groove, and the limiting ring away from the outer tube is located in the mounting hole and between the support member and the support rod.

[0014] By adopting the above technical solution, the two limit rings are respectively located in the limit ring and the installation groove, so they are not easy to collide with external objects, which is beneficial to improving the installation stability of the limit ring.

[0015] Optionally, in the limiting ring, the limiting ring away from the outer tube is set as an assembly ring, a positioning ring is provided in the mounting hole, the positioning ring is sleeved on the outside of the assembly ring and contacts the assembly ring, and the side of the positioning ring away from the assembly ring contacts the support member.

[0016] By adopting the above technical solution, the support member limits the assembly ring through the positioning ring, thereby reducing the probability of the assembly ring detaching from the corresponding annular groove, which is beneficial to improving the installation stability of the assembly ring.

[0017] Optionally, the support member is provided with a positioning groove connected to the mounting hole, a fixing ring is provided in the positioning groove, the fixing ring is made of a deformable material and fits with the inner wall of the positioning groove, the positioning ring is located between the fixing ring and the support ring, and the fixing ring and the support ring cooperate to clamp and limit the positioning ring.

[0018] By adopting the above technical solution, the support member limits the fixing ring through the positioning groove, so that the fixing ring and the support ring cooperate to clamp and position the positioning ring, which is beneficial to improving the installation stability of the positioning ring.

[0019] Optionally, a mounting ring is provided on the side of the support member facing away from the outer cylinder, the inner diameter of the mounting ring is smaller than the inner diameter of the mounting hole, a mounting bolt is provided between the mounting ring and the support member, and the mounting bolt passes through the mounting ring and is threadedly connected to the support member.

[0020] By adopting the above technical solution, the mounting ring is connected to the support member through the mounting bolts, and the support member seals the mounting hole through the mounting ring, thereby reducing the probability of the assembly ring or the fixing ring detaching from the mounting hole, which is beneficial to improving the installation stability of the support member.

[0021] Optionally, a connecting ring is provided between adjacent piston rods, and a clamping ring is fixedly provided on the side of the connecting ring facing away from the axis of the outer cylinder. Among two adjacent piston rods, the piston rod away from the axis of the outer cylinder is provided with a groove for installing the clamping ring, and the piston rod close to the axis of the outer cylinder passes through the connecting ring and fits with the connecting ring. A sealing ring is also provided between the two adjacent piston rods.

[0022] By adopting the above technical solution, between two adjacent piston rods, the piston rod located on the outer side limits the snap ring through the card slot, thereby restricting the connecting ring. The connecting ring separates the two adjacent piston rods, thereby reducing the wear when the piston rod moves. The gap between the two piston rods is blocked by the sealing ring, which is beneficial to improving the sealing effect of the adjacent sealing rods.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The outer cylinder drives all the piston rods to move in sequence through the hydraulic oil circuit. When installing the multi-stage oil cylinder, the supporting wheel contacts the plane of the installation position. When the piston rod drives the supporting member to move, the supporting member drives the supporting wheel to move along the moving direction of the piston rod through the supporting plate. The supporting wheel and the supporting plate cooperate to support the supporting member, thereby enabling the supporting member to support the piston rod, which is beneficial to reducing the probability of the piston rod bending due to its own weight when extending, beneficial to reducing the probability of the piston rod being damaged, and improving the service life of the multi-stage oil cylinder;

[0025] 2. The support rod limits the limit ring through the annular groove, so that the two limit rings cooperate to clamp and position the support ring. When the support rod drives the limit ring to move, the two limit rings cooperate to drive the support ring and the supporting member to move. When the supporting member is not required to provide support, the limit on the supporting member can be released by removing the limit ring, which is beneficial to improving the convenience of use of the supporting member. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the overall structure of a multi-stage hydraulic cylinder of a flat-push type dump truck.

[0027] Figure 2 is a schematic diagram designed to highlight the internal structures of the outer cylinder and the piston rod.

[0028] Figure 3 is Figure 2 an enlarged schematic diagram of part A in

[0029] Description of the reference numerals: 1, outer cylinder; 2, piston rod; 21, connecting ring; 211, snap ring; 22, card slot; 23, sealing ring; 3, support rod; 31, annular groove; 311, guiding surface; 32, limit ring; 33, assembly ring; 4, supporting member; 40, mounting hole; 401, positioning groove; 41, supporting plate; 42, supporting wheel; 43, support ring; 431, mounting groove; 44, positioning ring; 45, fixing ring; 46, mounting ring; 461, mounting bolt. Detailed Description of the Embodiment

[0030] The following further describes the present application in detail with reference to all the drawings.

[0031] An embodiment of the present application discloses a multi-stage hydraulic cylinder for a flat-pushing dump truck.

[0032] Embodiment:

[0033] Referring to Figure 1 and Figure 2 An embodiment of the present application provides a multi-stage hydraulic cylinder for a flat-pushing dump truck, including an outer cylinder 1. A plurality of piston rods 2 are arranged in the outer cylinder 1. The piston rods 2 are all hollow, and all the piston rods 2 are sleeved in sequence along the direction of the outer circle pointing to the axis of the outer cylinder 1, and any two adjacent piston rods 2 are slidably connected along the axial direction. A hydraulic oil circuit is provided between the outer cylinder 1 and all the piston rods 2. When installing the multi-stage hydraulic cylinder, the hydraulic oil circuit is communicated with an external hydraulic system, and hydraulic oil is conveyed into the hydraulic oil circuit through the hydraulic system, thereby driving all the piston rods 2 to move.

[0034] Referring to Figure 2 and Figure 3 The multi-stage hydraulic cylinder is further provided with a plurality of support members 4. The number of the support members 4 can be one, two, three or more, and the specific number is set according to the length of the piston rod 2. In this embodiment, two support members 4 are taken as an example for illustration. When all the piston rods 2 extend out of the outer cylinder 1 to form an output end, the two support members 4 are arranged along the length direction of the output end. Among all the piston rods 2, the piston rod 2 corresponding to the support member 4 is set as a support rod 3. The support member 4 is provided with an installation hole 40 opened transversely. The support rod 3 passes through the installation hole 40 and is located in the installation hole 40.

[0035] Referring to Figure 2 and Figure 3 A support ring 43 is arranged in the installation hole 40. The support ring 43 is fixedly connected with the support member 4. The support rod 3 passes through the support ring 43 and fits with the inner wall of the support ring 43. An annular groove 31 is opened in the outer circle of the support rod 3 along the circumferential direction, and a limiting ring 32 is arranged in each annular groove 31. The limiting ring 32 is made of a deformable material, such as rubber or spring steel. The limiting ring 32 fits with the inner wall of the annular groove 31 in the natural state. The support rod 3 limits the limiting ring 32 through the annular groove 31, so that the limiting ring 32 moves when the support rod 3 moves. The support further has a guiding surface 311. The guiding surface 311 intersects with the inner wall of the annular groove 31, and the guiding surface 311 inclines from the outer circle to the axis along the axial direction of the piston rod 2, thereby facilitating maintenance personnel to disassemble or install the limiting ring 32 along the guiding surface 311.

[0036] Referring to Figure 2 and Figure 3, the support ring 43 is located between the two limit rings 32, and both end faces of the support ring 43 in the axial direction are in contact with the limit rings 32, so that the two limit rings 32 cooperate to limit the displacement of the support ring 43 in the axial direction, enabling the support rod 3 to drive the support ring 43 and the support member 4 to move through the limit rings 32. An installation groove 431 is formed on one side of the support ring 43 close to the outer cylinder 1, and the limit ring 32 close to the outer cylinder 1 is located in the installation groove 431 and fits with the inner wall of the installation groove 431, so that the support ring 43 can accommodate the installation ring 46 close to the outer cylinder 1 through the installation groove 431, reducing the probability of the limit ring 32 falling off due to collision with external objects.

[0037] Refer to Figure 2 and Figure 3 , among the two limit rings 32 of the same support rod 3, the limit ring 32 far from the outer cylinder 1 is set as the assembly ring 33, and the assembly ring 33 is located in the installation hole 40. A positioning ring 44 is also provided in the installation hole 40. The positioning ring 44 is sleeved outside the assembly ring 33 and fits with the assembly ring 33. The side of the positioning ring 44 facing away from the assembly ring fits with the inner wall of the installation hole 40. The support member 4 limits the assembly ring through the positioning ring 44, reducing the probability of the assembly ring disengaging from the corresponding annular groove 31.

[0038] Refer to Figure 2 and Figure 3 , the support member 4 is provided with a positioning groove 401 communicating with the installation hole 40. The positioning groove 401 is arranged along the circumferential direction of the installation hole 40, and a fixing ring 45 is arranged in the positioning hole. The fixing ring 45 is also made of deformable material, such as rubber. In the natural state, the fixing ring 45 fits with the inner wall of the positioning groove 401. The support member 4 limits the fixing ring 45 through the positioning groove 401, so that the fixing ring 45 moves when the support member 4 moves. The positioning ring 44 is located between the fixing ring 45 and the support ring 43, and the fixing ring 45 and the support ring 43 cooperate to clamp and position the positioning ring 44. Further, the positioning ring 44 is provided with a disassembly and installation hole, which is beneficial to improving the convenience of disassembling or installing the positioning ring 44 when the positioning ring 44 limits the assembly ring 33.

[0039] Refer to Figure 2 and Figure 3 , on the side of the support member 4 facing away from the outer cylinder 1, there is an installation ring 46. The inner diameter of the installation ring 46 is smaller than the inner diameter of the installation hole 40. A plurality of installation bolts 461 are arranged between the installation ring 46 and the support member 4. The installation bolts 461 pass through the installation ring 46 and are threadedly connected with the support member 4. The support member 4 limits the installation ring 46 through the installation bolts 461. The installation ring 46 plugs the port of the installation hole 40 far from the support ring 43, thereby reducing the probability of the positioning ring 44, the fixing ring 45, and the assembly ring 33 disengaging from the installation hole 40, which is beneficial to improving the installation stability of the support member 4.

[0040] Refer toFigure 2 and Figure 3 At the lower end of the support member 4, a support plate 41 is provided. At the lower end of the support plate 41, a support wheel 42 is rotatably connected along the telescopic direction of the piston rod 2. When installing the multi-stage hydraulic cylinder, the support wheel 42 is brought into contact with the plane where the installation position is located. When the support rod 3 telescopes and drives the support member 4 to move, the support member 4 drives the support wheel 42 to roll along the installation plane through the support plate 41. The support wheel 42 supports the support member 4 through the cooperation of the support plate 41 and the support member 4, thereby reducing the probability of deformation of the support rod 3 due to gravity after extension.

[0041] Refer to Figure 2 and Figure 3 Between any two adjacent piston rods 2, a plurality of connecting rings 21 are provided. A snap ring 211 is fixedly provided on the outer circumference of the connecting ring 21 along the circumferential direction. Among the two piston rods 2, a clamping groove 22 adapted to the snap ring 211 is provided on the outer piston rod 2. The snap ring 211 is located in the clamping groove 22 and contacts the inner wall of the clamping groove 22. The piston rod 2 limits the snap ring 211 through the clamping groove 22, thereby restricting the axial movement of the connecting ring 21. The inner piston rod 2 among the two piston rods 2 passes through the connecting ring 21 and fits with the inner wall of the connecting ring 21. The connecting ring 21 separates the two adjacent piston rods 2, thereby facilitating the reduction of wear between the adjacent piston rods 2. A sealing ring 23 is further provided between the two adjacent piston rods 2, thereby improving the sealing effect between the piston rods 2.

[0042] The implementation principle of the multi-stage hydraulic cylinder of a flat-push type dump truck in the embodiment of the present application is as follows: Under the action of the limit ring 32, when the piston rod 2 moves, it drives the support member 4 to move. As a result, the support member 4 drives the support wheel 42 to move through the support plate 41. When the support wheel 42 contacts the installation plane, it supports the support member 4, thereby reducing the probability of deformation of all the piston rods 2 after extension and being beneficial to improving the service life of the multi-stage hydraulic cylinder.

[0043] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A multi-stage hydraulic cylinder for a push-type dump truck, comprising an outer cylinder (1), characterized in that: The outer cylinder (1) is provided with a plurality of piston rods (2), the plurality of piston rods (2) being sleeved in sequence along the direction of the axis of the outer cylinder (1) pointing to the outer circle, and any two adjacent piston rods (2) are slidably connected along the axis direction, the outer cylinder (1) is also provided with a hydraulic oil circuit for driving all the piston rods (2) to move, and also includes a plurality of support members (4), the plurality of support members (4) being arranged along the length direction of the piston rods (2), the plurality of support members (4) being sleeved on the outside of different piston rods (2), and moving synchronously with the corresponding piston rods (2), the lower end of the support member (4) being provided with a support plate (41), the end of the support plate (41) away from the support member (4) being rotatably connected to a support wheel (42), the rotation direction of the support wheel (42) being the same as the movement direction of the piston rod (2).

2. The multi-stage hydraulic cylinder for a push-type dump truck according to claim 1, characterized in that: In the piston rod (2), the piston rod (2) connected to the support member (4) is set as the support rod (3), the support member (4) is provided with a mounting hole (40) adapted to the outer circle of the support rod (3), a support ring (43) is arranged in the mounting hole (40), the support ring (43) is fixedly connected to the support member (4), the support rod (3) passes through the support ring (43) and fits with the inner wall of the support ring (43), the outer circle of the support rod (3) is provided with two groups of annular grooves (31) along the circumferential direction, the support ring (43) is located between the two annular grooves (31), and a limiting ring (32) is arranged in each of the annular grooves (31), when the support rod (3) moves, the limiting ring (32) is driven to move, the outer circle diameter of the limiting ring (32) is larger than the outer circle diameter of the support rod (3), the limiting ring (32) is made of a deformable material, and the two limiting rings (32) are in contact with the support ring (43).

3. The multi-stage hydraulic cylinder for a push-type dump truck according to claim 2, characterized in that: The support rod (3) is provided with a guide surface (311) connected to the inner wall of the annular groove (31), and the guide surface (311) is along the axis direction of the support rod (3) and gradually tilts from the outer circle of the support rod (3) to the axis.

4. The multi-stage hydraulic cylinder for a push-type dump truck according to claim 2, characterized in that: A mounting groove (431) is provided on a side of the support ring (43) close to the outer cylinder (1); of the two limiting rings (32), the limiting ring (32) close to the outer cylinder (1) is located in the mounting groove (431) and fits with the inner wall of the mounting groove (431), and the limiting ring (32) away from the outer cylinder (1) is located in the mounting hole (40) and between the support member (4) and the support rod (3).

5. The multi-stage hydraulic cylinder for a push-type dump truck according to claim 4, characterized in that: In the limiting ring (32), the limiting ring (32) away from the outer cylinder (1) is set as an assembly ring (33), and a positioning ring (44) is provided in the mounting hole (40). The positioning ring (44) is sleeved on the outside of the assembly ring (33) and contacts the assembly ring (33), and the side of the positioning ring (44) facing away from the assembly ring (33) contacts the support member (4).

6. The multi-stage hydraulic cylinder for a push-type dump truck according to claim 5, characterized in that: The support member (4) is provided with a positioning groove (401) which is in communication with the mounting hole (40); a fixing ring (45) is provided in the positioning groove (401); the fixing ring (45) is made of a deformable material and is in contact with the inner wall of the positioning groove (401); the positioning ring (44) is located between the fixing ring (45) and the supporting ring (43); the fixing ring (45) cooperates with the supporting ring (43) to clamp and limit the positioning ring (44).

7. The multi-stage hydraulic cylinder for a push-type dump truck according to claim 5, characterized in that: A mounting ring (46) is provided on the side of the support member (4) facing away from the outer cylinder (1); the inner diameter of the mounting ring (46) is smaller than the inner diameter of the mounting hole (40); a mounting bolt (461) is provided between the mounting ring (46) and the support member (4); the mounting bolt (461) passes through the mounting ring (46) and is threadedly connected to the support member (4).

8. The multi-stage hydraulic cylinder for a push-type dump truck according to claim 1, characterized in that: A connecting ring (21) is provided between adjacent piston rods (2), and a clamping ring (211) is fixedly provided on the side of the connecting ring (21) facing away from the axis of the outer cylinder (1). Among the two adjacent piston rods (2), the piston rod (2) away from the axis of the outer cylinder (1) is provided with a clamping groove (22) for installing the clamping ring (211), and the piston rod (2) close to the axis of the outer cylinder (1) passes through the connecting ring (21) and fits with the connecting ring (21). A sealing ring (23) is also provided between the two adjacent piston rods (2).

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