Oil storage circulation structure of hydraulic pipe bending machine

Abstract

The utility model discloses an oil storage circulation structure of a hydraulic pipe bender, which comprises a piston component, a piston cylinder, a piston rod, a piston rod, a piston rod and a piston rod, the sleeve is nested outside the piston cylinder, and an oil storage channel is formed by a nesting gap between the sleeve and the piston cylinder; the sealing sleeve is provided with a front oil channel for communicating the front end cavity with the oil storage channel; the pump body comprises an inner pipeline and a pump body oil duct; the rear end cavity is communicated with the oil bag through the inner pipeline, and the oil storage channel is communicated with the oil bag through the pump body oil channel. The utility model has the beneficial effects that the volume of the oil bag is effectively reduced, so that the whole machine structure is more compact; hydraulic oil is reused in a closed-loop mode in the reciprocating motion of the piston, and external supply dependence is reduced; and the nested oil storage channel avoids the leakage risk of an external pipeline.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic pipe bending equipment, and in particular to an oil storage and circulation structure for a hydraulic pipe bending machine. Background Technology

[0002] In existing hydraulic pipe bending machines, the long stroke of the piston rod driving the top wheel requires a large amount of hydraulic oil to replenish the rear cavity of the piston cylinder, resulting in a large oil sac and a bulky overall structure. Traditional structures, due to their unidirectional oil supply mode, cannot reuse redundant oil generated during piston movement, thus hindering the compact design of the equipment. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hydraulic pipe bending machine oil storage circulation structure that reduces the volume of the oil bladder by optimizing the oil circuit circulation structure.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an oil storage and circulation structure for a hydraulic pipe bending machine, including a piston assembly, comprising a front end cavity and a rear end cavity that are separated by the piston from the inner cavity of the piston cylinder; a sleeve, nested outside the piston cylinder, with the nesting gap between the two forming an oil storage channel; a sealing sleeve, having a front oil passage that connects the front end cavity and the oil storage channel; a pump body, including an inner pipe and a pump body oil passage; and an oil bladder, with the rear end cavity and the oil bladder connected through the inner pipe, and the oil storage channel and the oil bladder connected through the pump body oil passage.

[0005] Preferably, it includes an injection path and a return path for hydraulic oil circulation; the injection path is such that oil in the oil bladder enters the rear end cavity, and simultaneously, oil in the front end cavity enters the oil bladder for replenishment; the return path is such that hydraulic oil in the rear end cavity enters the front end cavity and the oil bladder respectively.

[0006] Preferably, in the injection path, hydraulic oil enters the rear end cavity through the inner pipe from the oil bladder, and simultaneously enters the oil bladder through the front end cavity via the front oil passage and the pump body oil passage.

[0007] Preferably, in the return path, the hydraulic oil in the rear cavity enters the pump body oil passage through the inner pipe, enters the oil storage channel and the oil bladder through the pump body oil passage, and then enters the front cavity through the oil storage channel via the front oil passage.

[0008] Preferably, the inner pipe includes an inlet end, an outlet end, and an upper end; the upper end is connected to a pressure relief valve, the pressure relief valve is connected to the pump body oil passage, and in the return path, the hydraulic oil in the rear cavity enters the pressure relief valve through the upper end and then enters the front cavity and the oil bladder through the pump body oil passage.

[0009] Preferably, the sealing sleeve is an annular component, with its inner wall sealed to the front end of the piston cylinder and its outer wall sealed to the front end of the sleeve.

[0010] Preferably, the inner pipe passes through the center of the pump body, with its inlet end directly connected to the rear end cavity, and its outlet end connected to the oil sac.

[0011] Preferably, the piston assembly includes a piston rod disposed inside the piston cylinder and connected to the piston at its rear end.

[0012] Preferably, it includes a return spring sleeved on the piston rod for pushing the piston back.

[0013] Preferably, it includes a top wheel connected to the piston rod for pipe bending operations.

[0014] The beneficial effects of this utility model are: effectively reducing the volume of the oil bladder, making the overall structure more compact; the hydraulic oil is reused in a closed loop during the reciprocating motion of the piston, reducing dependence on external replenishment; and the nested oil storage channel avoids the risk of leakage from external pipelines. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the piston's forward compression path in the oil storage circulation structure described in this utility model;

[0016] Figure 2 This is a schematic diagram of the return path of the piston pushing back in the oil storage circulation structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the sleeve in the oil storage and circulation structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the front oil passage on the sealing sleeve in the oil storage and circulation structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the pump body oil passage in the oil storage and circulation structure described in this utility model;

[0020] Figure 6 This is a schematic diagram of the internal pipeline in the oil storage and circulation structure described in this utility model;

[0021] Figure 7This is a schematic diagram of the connection structure of the internal pipe, pump body oil passage and oil sac described in this utility model. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0023] Example 1

[0024] Reference Figure 1-7 The diagram illustrates the oil storage and circulation structure of the hydraulic pipe bending machine proposed in this embodiment, including a piston assembly 1, a sleeve 2, a sealing sleeve 3, a pump body 4, and an oil bladder 5. The piston assembly 1 is used as the output component for hydraulic pipe bending operations. The sleeve 2 is sleeved on the outside of the piston assembly 1. The sealing sleeve 3 and the pump body 4 are located at the front and rear ends of the sleeve 2, respectively, for sealing the front and rear ends of the sleeve 2 and the piston assembly 1. The oil bladder 5 is used to supply hydraulic oil.

[0025] More specifically, the piston assembly 1 includes a front cavity 13 and a rear cavity 14, which are separated by the piston 11 from the inner cavity of the piston cylinder 12; a sleeve 2 is nested outside the piston cylinder 12, and the gap between the two forms an oil storage channel 21; a sealing sleeve 3 is provided with a front oil passage 31 that connects the front cavity 13 and the oil storage channel 21; and a pump body 4 is provided with an inner pipe 41 and a pump body oil passage 42. The rear end of the piston cylinder 12 is embedded in the inner pipe 41, the rear cavity 14 is connected to the oil bladder 5 through the inner pipe 41, and the oil storage channel 21 is connected to the oil bladder 5 through the pump body oil passage 42.

[0026] In one embodiment, the inner pipe 41 runs through the center of the pump body 4 and includes an inlet end 411, an outlet end 412 and an upper end 413. The inlet end 411 is directly connected to the rear cavity 14, and the outlet end 412 is connected to the oil sac 5.

[0027] Reference Figure 1-2 As illustrated, the oil storage and circulation structure in this embodiment includes two oil circulation paths: a forward-pushing path for piston 11 and a return path for piston 11 pushed back, as shown below. Figure 1 The middle arrow indicates the path of hydraulic oil injection, such as... Figure 2 The middle arrow indicates the return path of the hydraulic oil.

[0028] When the piston 11 pushes forward, the space of the front cavity 13 gradually decreases, and the space of the rear cavity 14 gradually increases. The rear cavity 14 requires a large amount of hydraulic oil, so the oil supply to the oil bladder 5 is required to be large, resulting in a relatively large volume of the oil bladder 5. This leads to a larger and heavier overall housing. Therefore, this embodiment proposes a hydraulic oil injection path and return path circulation structure.

[0029] The injection path involves oil from the oil bladder 5 entering the rear cavity 14, while simultaneously, oil from the front cavity 13 enters the oil bladder 5 for replenishment. The return path involves hydraulic oil from the rear cavity 14 entering both the front cavity 13 and the oil bladder 5.

[0030] Specifically, the hydraulic oil enters the rear cavity 14 through the inner pipe 41 from the oil bladder 5, and simultaneously enters the oil bladder 5 through the front oil passage 31 and the pump body oil passage 42 in sequence from the front cavity 13.

[0031] Specifically, the hydraulic oil in the rear cavity 14 enters the pump body oil passage 42 through the inner pipe 41, enters the oil storage channel 21 and the oil sac 5 through the pump body oil passage 42, and then enters the front cavity 13 through the front oil passage 31 via the oil storage channel 21.

[0032] In this embodiment, regardless of whether it is the injection path or the return path, the outlet end 412 of the inner pipe 41 is directly connected to the oil bladder 5 to realize the flow of the main oil supply channel between the rear cavity 14 and the oil bladder 5.

[0033] Furthermore, considering the relationship between the various cavities and their interconnected structure, the specific structure of the injection path is as follows: when the piston 11 pushes forward, the hydraulic oil in the oil bladder 5 directly enters the rear cavity 14 through the inner pipe 41 to fill it. At the same time, the hydraulic oil in the front cavity 13 is squeezed into the oil storage channel 21 through the front oil passage 31, and then flows back to the oil bladder 5 through the pump body oil passage 42 to complete the replenishment of the oil bladder 5.

[0034] The specific structure of the return path is as follows: when the pressure is released (i.e., the piston 11 is pushed back), the piston 11 returns to its original position under the thrust of the return spring 16. The space of the front cavity 13 gradually increases, and the corresponding rear cavity 14 gradually decreases. During the return process, the hydraulic oil that has been filled in the rear cavity 14 is directly pressed back into the oil bladder 5 and the front cavity 13 by the piston 11 from the inner pipe 41. It should be noted that the pressing back into the oil bladder 5 during this process includes the main oil supply method that is directly pressed in from the outlet end 412, and the auxiliary oil supply method that enters the pump body oil passage 42 from the cavity of the pump body 4 and is then pressed into the oil bladder 5 and the oil storage channel 21 respectively. Then, the front cavity 13 is filled by the oil storage channel 21 through the front oil passage 31.

[0035] The process of moving from the push path to the return path, and then from the return path structure back to the push path, is repeated in this cycle to achieve a mutually looping structure between the push path and the return path.

[0036] In one embodiment, the inner pipe 41 further includes an upper end 413; this upper end 413 is connected to a pressure relief valve 7, which is located in a cavity within the pump body 4 (or directly connected to the pump body oil passage 42 if there is no pressure relief valve 7) and is connected to the pump body oil passage 42. In the return path, the hydraulic oil in the rear cavity 14 first enters the pump body 4 through the inlet end 411. The main oil supply channel directly presses the hydraulic oil into the oil sac 5 from the outlet end 412, and also includes the oil entering the pressure relief valve 7 from the upper end 413 before entering the pump body oil passage 42.

[0037] The oil then enters the front end cavity 13 and the oil sac 5 through the pump body oil passage 42, respectively. The oil passage 42 enters the front end cavity 13 via the oil storage channel 21 and the front oil passage 31 in sequence. (Refer to...) Figure 4-7 As illustrated, in one embodiment, the sealing sleeve 3 is an annular component, with its inner wall sealingly connected to the front end of the piston cylinder 12 and its outer wall sealingly connected to the front end of the sleeve 2. A similar installation structure is used for the pump body 4, with the inner pipe 41 being a hollow internal channel within the pump body 4, and the pump body oil passage 42 being an externally located pipe within the nested gap between the piston cylinder 12 and the sleeve 2. This installation structure can be achieved through interference fit or threaded fit of the pipes.

[0038] Furthermore, in one embodiment, the piston assembly 1 includes a piston rod 15 disposed inside the piston cylinder 12 and connected to the piston 11 at its rear end, a return spring 16 sleeved on the piston rod 15 for pushing the piston 11 back, and a top wheel 6 connected to the piston rod 15 for pipe bending operations.

[0039] This embodiment of the hydraulic pipe bending machine features a structure for the circulation of hydraulic oil. When the piston 11 pushes forward, the hydraulic oil at the front end of the piston cylinder 12 is squeezed into the oil storage channel 21 and flows back to the oil sac 5 through the pump body oil passage 42, thereby replenishing the hydraulic oil in the oil sac 5. When pressure is released, the piston 11 returns to its original position under the thrust of the return spring 16, pushing the oil at the rear end of the piston cylinder 12 back into the oil storage channel 21 through the pump body oil passage 42, thus refilling the front end of the piston cylinder 12, and repeating the cycle. In this embodiment, the nested channel structure and bidirectional oil circulation enable the internal reuse of hydraulic oil during the piston 11's movement, thereby reducing the volume of the oil sac 5.

[0040] It should be noted that this embodiment aims at the circulation structure of the hydraulic oil injection path and return path, in order to realize the circulation mechanism of hydraulic oil inside the pipe bending machine, rather than the principle of pressure relief or pipe bending operation itself, that is, the structural component connection. The functional implementation principle of the hydraulic pipe bending machine itself and some of its own functions are all existing mature technologies. For example, how the hydraulic pipe bending machine realizes the principle of pressure relief, how the pipe bending machine realizes pipe bending, how the piston 11 controls the forward and backward movement, the internal structure of the pump body 4 itself, and the specific structure of the connection between the oil bladder 5 and the pump body 4 at the inner pipe 41, etc. The above are just examples of technical issues. Of course, there should be other technical issues, including but not limited to the same or similar technical issues, all of which are existing mature technologies. The technical features corresponding to the technical problems to be solved are also non-essential technical features of this application. When judging whether this application is fully disclosed, it should not deviate from the core meaning, so it will not be described in detail.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of protection of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description and ideas. It is neither necessary nor possible to exhaustively describe all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the technical solution of this utility model should be covered within the scope of protection of the claims of this utility model.

Claims

1. A hydraulic pipe bender oil reservoir circulation structure characterized by: include, The piston assembly (1) includes a front cavity (13) and a rear cavity (14) that separate the inner cavity of the piston cylinder (12) by a piston (11); The sleeve (2) is nested outside the piston cylinder (12), and the gap between the two forms an oil storage channel (21); The sealing sleeve (3) is provided with a front oil passage (31) that connects the front end cavity (13) and the oil storage channel (21); The pump body (4) includes an internal pipe (41) and a pump body oil passage (42); The oil bladder (5) is connected to the rear end cavity (14) through the inner pipe (41), and the oil storage channel (21) is connected to the oil bladder (5) through the pump body oil passage (42).

2. The oil storage circulation structure of the hydraulic pipe bending machine according to claim 1, characterized by: This includes the injection path and return path for hydraulic oil circulation; The injection path is such that the oil in the oil bladder (5) enters the rear cavity (14), and simultaneously, the oil in the front cavity (13) enters the oil bladder (5) for replenishment; The return path is such that the hydraulic oil in the rear cavity (14) enters the front cavity (13) and the oil sac (5) respectively.

3. The oil storage circulation structure of the hydraulic pipe bending machine according to claim 2, characterized by: In the push-in path Hydraulic oil enters the rear end cavity (14) through the inner pipe (41) via the oil bladder (5), and simultaneously enters the oil bladder (5) through the front end cavity (13) via the front oil passage (31) and the pump body oil passage (42).

4. The oil storage circulation structure of the hydraulic pipe bending machine according to claim 2, characterized by: In the return path The hydraulic oil in the rear cavity (14) enters the pump body oil passage (42) through the inner pipe (41), enters the oil storage channel (21) and the oil bladder (5) through the pump body oil passage (42), and then enters the front cavity (13) through the front oil passage (31) via the oil storage channel (21).

5. The oil storage circulation structure of the hydraulic pipe bending machine according to claim 2, characterized by: The inner pipe (41) includes an inlet end (411), an outlet end (412), and an upper end (413); The upper end (413) is connected to the pressure relief valve (7), and the pressure relief valve (7) is connected to the pump body oil passage (42). In the return path, the hydraulic oil in the rear end cavity (14) enters the pressure relief valve (7) through the upper end (413) and then enters the front end cavity (13) and the oil sac (5) through the pump body oil passage (42).

6. The oil storage circulation structure of the hydraulic pipe bending machine according to claim 1, characterized by: The sealing sleeve (3) is an annular component, with its inner wall sealed to the front end of the piston cylinder (12) and its outer wall sealed to the front end of the sleeve (2).

7. The oil storage circulation structure of the hydraulic pipe bending machine according to claim 5, characterized by: The inner pipe (41) passes through the center of the pump body (4), and its inlet end (411) is directly connected to the rear end cavity (14), and its outlet end (412) is connected to the oil sac (5).

8. The oil storage circulation structure of the hydraulic pipe bending machine according to claim 1, characterized by: The piston assembly (1) includes a piston rod (15) disposed inside the piston cylinder (12) and connected at its rear end to the piston (11).

9. The oil storage circulation structure of the hydraulic pipe bending machine according to claim 8, characterized by: Includes a return spring (16) sleeved on the piston rod (15) for pushing the piston (11) back.

10. The oil storage circulation structure of the hydraulic pipe bending machine according to claim 8 or 9, characterized by: Includes a top wheel (6) connected to the piston rod (15) for pipe bending operations.

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